tires on AWD cars...change one means change them all?
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This is a discussion on tires on AWD cars...change one means change them all? within the General Maintenance, Troubleshooting & Accidents. forums, part of the Tech & Modifying & General Repairs category; So my gf told me that her mom was told by Les Schwab that if you change one tire on ...

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    Question tires on AWD cars...change one means change them all?

    So my gf told me that her mom was told by Les Schwab that if you change one tire on a Subaru, you have to change all of them b/c it's all-wheel drive. Is that true? I came from owning only FWD cars so that concept is a bit new to me. It make sense...sorta but not entirely. So is that true?

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    He simply abides. SD_GR's Avatar
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    The owner's manual specifies the maximum allowable variance between diameters.
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    Registered User WRX13oy's Avatar
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    ive heard about that too. but i dont think it is necessary. I dont think it would even affect the car at all. unless its a big difference in size ie: 18 inch wheels vs stock 15
    Last edited by WRX13oy; 03-24-2008 at 11:31 PM.
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    Registered User Lbleiweiss's Avatar
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    Quote Originally Posted by WRX13oy View Post
    ive heard about that too. but i dont think it is necessary. I dont think it would even affect the car at all. unless its a big difference in size ie: 18 inch wheels vs stock 15
    ^^^ All Lies^^^ Listen to what SD_GR said. When I got my WRX one of the tires was a diff brand/tread life. You get a weird "knock" in your suspension when going over bumps and such.

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    Moderator Donkey's Avatar
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    Also can cause damage to the differential unit.I think a 1/4" is the maximum allowance between sizes.You can shave the new tire down instead of replacing all four.
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    Registered User natedawg9640's Avatar
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    the reason behind the possible damage is that all wheels are drivin wheels... so they are all connected by the same drivetrain. thatis in turn means they are all doing full rotations at basically the same rate. throw a different outside diameter on there and that wheel will be rotating faster or slower depending on the size than all the other three... = bad news for the differentials.
    yup

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