Mixing
Is it absolutely necessary to replace all four tyres on a manual 2008 Subaru Impreza?
up vote
10
down vote
favorite
I destroyed a back tire on my 2008 Subaru Impreza manual transmission with viscous coupling.
The manual says all four tires must be the same size.
The spare tire must only be mounted onto the rear axle when applicable.
I don't need to pull a fuse to disable AWB on my manual, but automatic transmissions do.
I talked to a tire mechanic who has been doing this for decades. He says that I do NOT have to replace all four tires with new ones. He said replacing just the single blown rear tire with a new one (same general size, but different brand and likely slightly different circumference) will be totally fine. He says he has never had any problems doing it on other Subarus. In fact, the spare tire that I was running on WAS of a different size and it ran on it just fine for 75 miles and no warning lights.
In this case, is it ok to drive around with one new tire on my Subaru? Or do I still have to replace all four?
The mechanic said that as long as the tires are all of the same size (205/55/16) little differences in tread depth and manufacturer differences won't matter.
tires subaru
edited 15 hours ago
Michael
1034
asked 21 hours ago
fuzzybabybunny
15113
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fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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add a comment |
up vote
10
down vote
favorite
I destroyed a back tire on my 2008 Subaru Impreza manual transmission with viscous coupling.
The manual says all four tires must be the same size.
The spare tire must only be mounted onto the rear axle when applicable.
I don't need to pull a fuse to disable AWB on my manual, but automatic transmissions do.
I talked to a tire mechanic who has been doing this for decades. He says that I do NOT have to replace all four tires with new ones. He said replacing just the single blown rear tire with a new one (same general size, but different brand and likely slightly different circumference) will be totally fine. He says he has never had any problems doing it on other Subarus. In fact, the spare tire that I was running on WAS of a different size and it ran on it just fine for 75 miles and no warning lights.
In this case, is it ok to drive around with one new tire on my Subaru? Or do I still have to replace all four?
The mechanic said that as long as the tires are all of the same size (205/55/16) little differences in tread depth and manufacturer differences won't matter.
tires subaru
edited 15 hours ago
Michael
1034
asked 21 hours ago
fuzzybabybunny
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
1
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
2
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago
add a comment |
up vote
10
down vote
favorite
up vote
10
down vote
favorite
I destroyed a back tire on my 2008 Subaru Impreza manual transmission with viscous coupling.
The manual says all four tires must be the same size.
The spare tire must only be mounted onto the rear axle when applicable.
I don't need to pull a fuse to disable AWB on my manual, but automatic transmissions do.
I talked to a tire mechanic who has been doing this for decades. He says that I do NOT have to replace all four tires with new ones. He said replacing just the single blown rear tire with a new one (same general size, but different brand and likely slightly different circumference) will be totally fine. He says he has never had any problems doing it on other Subarus. In fact, the spare tire that I was running on WAS of a different size and it ran on it just fine for 75 miles and no warning lights.
In this case, is it ok to drive around with one new tire on my Subaru? Or do I still have to replace all four?
The mechanic said that as long as the tires are all of the same size (205/55/16) little differences in tread depth and manufacturer differences won't matter.
tires subaru
edited 15 hours ago
Michael
1034
asked 21 hours ago
fuzzybabybunny
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
I destroyed a back tire on my 2008 Subaru Impreza manual transmission with viscous coupling.
The manual says all four tires must be the same size.
The spare tire must only be mounted onto the rear axle when applicable.
I don't need to pull a fuse to disable AWB on my manual, but automatic transmissions do.
I talked to a tire mechanic who has been doing this for decades. He says that I do NOT have to replace all four tires with new ones. He said replacing just the single blown rear tire with a new one (same general size, but different brand and likely slightly different circumference) will be totally fine. He says he has never had any problems doing it on other Subarus. In fact, the spare tire that I was running on WAS of a different size and it ran on it just fine for 75 miles and no warning lights.
In this case, is it ok to drive around with one new tire on my Subaru? Or do I still have to replace all four?
The mechanic said that as long as the tires are all of the same size (205/55/16) little differences in tread depth and manufacturer differences won't matter.
tires subaru
tires subaru
edited 15 hours ago
Michael
1034
asked 21 hours ago
fuzzybabybunny
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 15 hours ago
Michael
1034
asked 21 hours ago
fuzzybabybunny
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
edited 15 hours ago
Michael
1034
edited 15 hours ago
Michael
1034
edited 15 hours ago
Michael
1034
1034
asked 21 hours ago
fuzzybabybunny
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
asked 21 hours ago
fuzzybabybunny
15113
asked 21 hours ago
fuzzybabybunny
15113
15113
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
fuzzybabybunny is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
1
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
2
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago
add a comment |
Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
1
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
2
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago
Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
1
1
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
2
2
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago
add a comment |
4 Answers
4
active
oldest
votes
up vote
14
down vote
Driving around with tires of different rolling radii will cause the viscous coupling to get hot / overheat and eventually fail...
As it will probably happen long enough after the tire fitter did the tire, then he won't have to pay, but you will...
This is a known issue, both on Subaru and Volvo car with awd and viscous couplings, however, you have read the manufacturer's instructions, now it is up to you.
Just out of interest, here is a similar answer: https://mechanics.stackexchange.com/a/51301/10976
answered 20 hours ago
Solar Mike
16.7k21030
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
add a comment |
up vote
6
down vote
It is possible to get new tires shaved down to the same tread depth as the existing worn ones. It may be worth getting that done, then you wont have to replace them all.
For example this article says -
Buying four new tires may be needlessly expensive for drivers who only
need a single tire to join the three other moderately worn tires. But
you can buy a single new tire from $BIG_TIRE_VENDOR and have the
company shave it to the tread depth that matches the depth of your
other tires. It will shave any tire you buy from the company, usually
for $25 to $30.
Note that shaving a tire will likely nullify its tread-wear warranty. Other retailers may offer a similar service, though the special equipment to shave a tire’s tread isn’t common.
So, no, it is not absolutely necessary to replace all four wheels.
edited 16 hours ago
Freiheit
318112
answered 20 hours ago
HandyHowie
9,51011133
add a comment |
up vote
5
down vote
Subaru's have lots of quirks, and tire size is one of them. Talk to a Subaru mechanic rather than a tire-changer, and you'll get a completely different answer.
Subaru's are well known for having tight tolerances on wheels. If you cannot change all four at the same time, buy a new tire of exactly the same make and model, and have the new tire shaved down to the same size as the others.
The tolerance on Subarus is 1/4" in circumference - which translates to between 1/32 and 2/32 of an inch difference in tread depth (or radius).
You might think that shaving a tire to be smaller is an expensive waste of money. But think of the cost of replacing your center differential (well into four figures - often cheaper to scrap the car), and it's cheap insurance.
answered 14 hours ago
PeteCon
6,244823
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
add a comment |
up vote
0
down vote
Are you sure the manual refers to the size to the level of a tyre wear?
Usually the same car can have different car tyres applied and it only refers to use the same size on all four. The size is described with something like 205/85 R16 (of course numbers will differ).
As long as you replace your tyre with the same size (so for 205/85 R16 use another 205/85 R16 but not 215/75 R16) you're fine even if you go with a different brand. It is advisable though to replace them in pairs, both tyres on the same axis.
answered 15 hours ago
Ister
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
add a comment |
4 Answers
4
active
oldest
votes
4 Answers
4
active
oldest
votes
active
oldest
votes
active
oldest
votes
up vote
14
down vote
Driving around with tires of different rolling radii will cause the viscous coupling to get hot / overheat and eventually fail...
As it will probably happen long enough after the tire fitter did the tire, then he won't have to pay, but you will...
This is a known issue, both on Subaru and Volvo car with awd and viscous couplings, however, you have read the manufacturer's instructions, now it is up to you.
Just out of interest, here is a similar answer: https://mechanics.stackexchange.com/a/51301/10976
answered 20 hours ago
Solar Mike
16.7k21030
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
add a comment |
up vote
14
down vote
Driving around with tires of different rolling radii will cause the viscous coupling to get hot / overheat and eventually fail...
As it will probably happen long enough after the tire fitter did the tire, then he won't have to pay, but you will...
This is a known issue, both on Subaru and Volvo car with awd and viscous couplings, however, you have read the manufacturer's instructions, now it is up to you.
Just out of interest, here is a similar answer: https://mechanics.stackexchange.com/a/51301/10976
answered 20 hours ago
Solar Mike
16.7k21030
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
add a comment |
up vote
14
down vote
up vote
14
down vote
Driving around with tires of different rolling radii will cause the viscous coupling to get hot / overheat and eventually fail...
As it will probably happen long enough after the tire fitter did the tire, then he won't have to pay, but you will...
This is a known issue, both on Subaru and Volvo car with awd and viscous couplings, however, you have read the manufacturer's instructions, now it is up to you.
Just out of interest, here is a similar answer: https://mechanics.stackexchange.com/a/51301/10976
answered 20 hours ago
Solar Mike
16.7k21030
Driving around with tires of different rolling radii will cause the viscous coupling to get hot / overheat and eventually fail...
As it will probably happen long enough after the tire fitter did the tire, then he won't have to pay, but you will...
This is a known issue, both on Subaru and Volvo car with awd and viscous couplings, however, you have read the manufacturer's instructions, now it is up to you.
Just out of interest, here is a similar answer: https://mechanics.stackexchange.com/a/51301/10976
answered 20 hours ago
Solar Mike
16.7k21030
answered 20 hours ago
Solar Mike
16.7k21030
answered 20 hours ago
Solar Mike
16.7k21030
answered 20 hours ago
Solar Mike
16.7k21030
16.7k21030
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
add a comment |
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
Yep, the increased wear on the VC is small but cumulative.
– motosubatsu
20 hours ago
2
2
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
Note that this also means you should keep all 4 tires at close to the same pressure. One tire running very soft will result in the same effective diameter discrepancy
– Carl Witthoft
16 hours ago
4
4
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
@CarlWitthoft while you are essentially correct better to say that the tires should be frequently checked for inflation according to the pressures listed in the handbook/sticker on the car. Impreza's do have a front/rear difference in tire pressure to account for the weight distribution and running the rears at the same as the fronts can produce some entertaining handling characteristics!
– motosubatsu
14 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
Mitsubishi also have the same issue and have different pressures front/rear as well. With AWD it's extra important to read the owner's manual any time you deal with anything tire related.
– Brian Knoblauch
13 hours ago
add a comment |
up vote
6
down vote
It is possible to get new tires shaved down to the same tread depth as the existing worn ones. It may be worth getting that done, then you wont have to replace them all.
For example this article says -
Buying four new tires may be needlessly expensive for drivers who only
need a single tire to join the three other moderately worn tires. But
you can buy a single new tire from $BIG_TIRE_VENDOR and have the
company shave it to the tread depth that matches the depth of your
other tires. It will shave any tire you buy from the company, usually
for $25 to $30.
Note that shaving a tire will likely nullify its tread-wear warranty. Other retailers may offer a similar service, though the special equipment to shave a tire’s tread isn’t common.
So, no, it is not absolutely necessary to replace all four wheels.
edited 16 hours ago
Freiheit
318112
answered 20 hours ago
HandyHowie
9,51011133
add a comment |
up vote
6
down vote
It is possible to get new tires shaved down to the same tread depth as the existing worn ones. It may be worth getting that done, then you wont have to replace them all.
For example this article says -
Buying four new tires may be needlessly expensive for drivers who only
need a single tire to join the three other moderately worn tires. But
you can buy a single new tire from $BIG_TIRE_VENDOR and have the
company shave it to the tread depth that matches the depth of your
other tires. It will shave any tire you buy from the company, usually
for $25 to $30.
Note that shaving a tire will likely nullify its tread-wear warranty. Other retailers may offer a similar service, though the special equipment to shave a tire’s tread isn’t common.
So, no, it is not absolutely necessary to replace all four wheels.
edited 16 hours ago
Freiheit
318112
answered 20 hours ago
HandyHowie
9,51011133
add a comment |
up vote
6
down vote
up vote
6
down vote
It is possible to get new tires shaved down to the same tread depth as the existing worn ones. It may be worth getting that done, then you wont have to replace them all.
For example this article says -
Buying four new tires may be needlessly expensive for drivers who only
need a single tire to join the three other moderately worn tires. But
you can buy a single new tire from $BIG_TIRE_VENDOR and have the
company shave it to the tread depth that matches the depth of your
other tires. It will shave any tire you buy from the company, usually
for $25 to $30.
Note that shaving a tire will likely nullify its tread-wear warranty. Other retailers may offer a similar service, though the special equipment to shave a tire’s tread isn’t common.
So, no, it is not absolutely necessary to replace all four wheels.
edited 16 hours ago
Freiheit
318112
answered 20 hours ago
HandyHowie
9,51011133
It is possible to get new tires shaved down to the same tread depth as the existing worn ones. It may be worth getting that done, then you wont have to replace them all.
For example this article says -
Buying four new tires may be needlessly expensive for drivers who only
need a single tire to join the three other moderately worn tires. But
you can buy a single new tire from $BIG_TIRE_VENDOR and have the
company shave it to the tread depth that matches the depth of your
other tires. It will shave any tire you buy from the company, usually
for $25 to $30.
Note that shaving a tire will likely nullify its tread-wear warranty. Other retailers may offer a similar service, though the special equipment to shave a tire’s tread isn’t common.
So, no, it is not absolutely necessary to replace all four wheels.
edited 16 hours ago
Freiheit
318112
answered 20 hours ago
HandyHowie
9,51011133
edited 16 hours ago
Freiheit
318112
edited 16 hours ago
Freiheit
318112
edited 16 hours ago
Freiheit
318112
318112
answered 20 hours ago
HandyHowie
9,51011133
answered 20 hours ago
HandyHowie
9,51011133
answered 20 hours ago
HandyHowie
9,51011133
9,51011133
add a comment |
add a comment |
up vote
5
down vote
Subaru's have lots of quirks, and tire size is one of them. Talk to a Subaru mechanic rather than a tire-changer, and you'll get a completely different answer.
Subaru's are well known for having tight tolerances on wheels. If you cannot change all four at the same time, buy a new tire of exactly the same make and model, and have the new tire shaved down to the same size as the others.
The tolerance on Subarus is 1/4" in circumference - which translates to between 1/32 and 2/32 of an inch difference in tread depth (or radius).
You might think that shaving a tire to be smaller is an expensive waste of money. But think of the cost of replacing your center differential (well into four figures - often cheaper to scrap the car), and it's cheap insurance.
answered 14 hours ago
PeteCon
6,244823
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
add a comment |
up vote
5
down vote
Subaru's have lots of quirks, and tire size is one of them. Talk to a Subaru mechanic rather than a tire-changer, and you'll get a completely different answer.
Subaru's are well known for having tight tolerances on wheels. If you cannot change all four at the same time, buy a new tire of exactly the same make and model, and have the new tire shaved down to the same size as the others.
The tolerance on Subarus is 1/4" in circumference - which translates to between 1/32 and 2/32 of an inch difference in tread depth (or radius).
You might think that shaving a tire to be smaller is an expensive waste of money. But think of the cost of replacing your center differential (well into four figures - often cheaper to scrap the car), and it's cheap insurance.
answered 14 hours ago
PeteCon
6,244823
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
add a comment |
up vote
5
down vote
up vote
5
down vote
Subaru's have lots of quirks, and tire size is one of them. Talk to a Subaru mechanic rather than a tire-changer, and you'll get a completely different answer.
Subaru's are well known for having tight tolerances on wheels. If you cannot change all four at the same time, buy a new tire of exactly the same make and model, and have the new tire shaved down to the same size as the others.
The tolerance on Subarus is 1/4" in circumference - which translates to between 1/32 and 2/32 of an inch difference in tread depth (or radius).
You might think that shaving a tire to be smaller is an expensive waste of money. But think of the cost of replacing your center differential (well into four figures - often cheaper to scrap the car), and it's cheap insurance.
answered 14 hours ago
PeteCon
6,244823
Subaru's have lots of quirks, and tire size is one of them. Talk to a Subaru mechanic rather than a tire-changer, and you'll get a completely different answer.
Subaru's are well known for having tight tolerances on wheels. If you cannot change all four at the same time, buy a new tire of exactly the same make and model, and have the new tire shaved down to the same size as the others.
The tolerance on Subarus is 1/4" in circumference - which translates to between 1/32 and 2/32 of an inch difference in tread depth (or radius).
You might think that shaving a tire to be smaller is an expensive waste of money. But think of the cost of replacing your center differential (well into four figures - often cheaper to scrap the car), and it's cheap insurance.
answered 14 hours ago
PeteCon
6,244823
answered 14 hours ago
PeteCon
6,244823
answered 14 hours ago
PeteCon
6,244823
answered 14 hours ago
PeteCon
6,244823
6,244823
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
add a comment |
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
1
1
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
It's also worth mentioning that circumference is the only measurement that matters. Diameters/tread depth don't correspond directly between different tire models or manufacturers, even before they've worn at all.
– Shamtam
11 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
Better yet, buy a used tire of exact same model :) Scrap yards sell them for peanuts, and there are "national" databases of available tyres. Quite cheap, does the trick. IMO, shaving is overrated on consumer vehicles, the few mm ov available thread depth vs tire radius is a small fraction.
– Dima Tisnek
2 hours ago
add a comment |
up vote
0
down vote
Are you sure the manual refers to the size to the level of a tyre wear?
Usually the same car can have different car tyres applied and it only refers to use the same size on all four. The size is described with something like 205/85 R16 (of course numbers will differ).
As long as you replace your tyre with the same size (so for 205/85 R16 use another 205/85 R16 but not 215/75 R16) you're fine even if you go with a different brand. It is advisable though to replace them in pairs, both tyres on the same axis.
answered 15 hours ago
Ister
1092
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Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
add a comment |
up vote
0
down vote
Are you sure the manual refers to the size to the level of a tyre wear?
Usually the same car can have different car tyres applied and it only refers to use the same size on all four. The size is described with something like 205/85 R16 (of course numbers will differ).
As long as you replace your tyre with the same size (so for 205/85 R16 use another 205/85 R16 but not 215/75 R16) you're fine even if you go with a different brand. It is advisable though to replace them in pairs, both tyres on the same axis.
answered 15 hours ago
Ister
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
add a comment |
up vote
0
down vote
up vote
0
down vote
Are you sure the manual refers to the size to the level of a tyre wear?
Usually the same car can have different car tyres applied and it only refers to use the same size on all four. The size is described with something like 205/85 R16 (of course numbers will differ).
As long as you replace your tyre with the same size (so for 205/85 R16 use another 205/85 R16 but not 215/75 R16) you're fine even if you go with a different brand. It is advisable though to replace them in pairs, both tyres on the same axis.
answered 15 hours ago
Ister
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Are you sure the manual refers to the size to the level of a tyre wear?
Usually the same car can have different car tyres applied and it only refers to use the same size on all four. The size is described with something like 205/85 R16 (of course numbers will differ).
As long as you replace your tyre with the same size (so for 205/85 R16 use another 205/85 R16 but not 215/75 R16) you're fine even if you go with a different brand. It is advisable though to replace them in pairs, both tyres on the same axis.
answered 15 hours ago
Ister
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 15 hours ago
Ister
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
answered 15 hours ago
Ister
1092
answered 15 hours ago
Ister
1092
1092
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
New contributor
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Ister is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
add a comment |
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
Yes, the manual is referring to the level of tire wear. As the tire wears, it shrinks. Subaru (and Audi for that matter) dictate a tolerance of 1/4 inch difference in circumference between all tires. Normal wear and tear will easily surpass that.
– Ellesedil
13 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
In some juristictions, tire make and model much match for left and right on same axle.
– Dima Tisnek
2 hours ago
add a comment |
fuzzybabybunny is a new contributor. Be nice, and check out our Code of Conduct.
fuzzybabybunny is a new contributor. Be nice, and check out our Code of Conduct.
fuzzybabybunny is a new contributor. Be nice, and check out our Code of Conduct.
fuzzybabybunny is a new contributor. Be nice, and check out our Code of Conduct.
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Welcome to the site. You might want to look into the possibility of buying a part worn. Especially if you can find one that same brand as the tyre on the other side of the car.
– Steve Matthews
20 hours ago
1
Even tires of the same size can provide extreme differences in traction, think of a tire made for economy versus a tire made for performance/grip. Spare wheels are only meant for short(er) distances at lower speeds. Always try to have the same tires on the back and/or the front of your vehicle especially on the drive wheels.
– BossRoss
19 hours ago
2
Have to agree with @BossRoss - matching brand (and ideally) model across both tires on an axle is highly recommended, especially on more powerful vehicles (you don't mention which model Impreza this is but the wheel size suggests it's likely not to be a WRX or STI). Add in the blithe attitude to mixing new and old and potential for diff wear and I'd be seriously questioning this tire fitter's judgement!
– motosubatsu
13 hours ago