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four new tires?

bsaimobsaimo Member Posts: 1
I have a 98' legacy outback with a set of kingstar tires that have approx. 20,000 miles on them. One recently was punctured and les schwab is telling me it's destroyed. They've also said that due to my AWD I'll need 4 new tires. Any advice on whether this is true? If not, how can I find an acceptable used tire? Also, should this be covered by Schwab's warranty?

Comments

  • xwesxxwesx Member Posts: 16,582
    I have no idea about the warranty question, as I haven't read it. At 20,000 miles, there is likely enough wear on the tires that a new one will be enough larger as to induce strain on the car's drivetrain. It really doesn't take much! I think the official specification is less than 0.25" difference in circumference. Essentially what that means is that if your tires are off by more than 1/32" in tread depth, you're outside of that spec.

    That said, yes, you can use a used tire (as long as it is the same model, tread pattern, etc) with similar tread depth, if that is your preference. Finding one that is an exact match might be a trick, though! Another option is to have a new tire shaved to match the existing ones. Not all shops have the equipment to do that.

    I had a '96 Outback that went through a nearly identical situation as your '98. The tires that were on it had a 70,000-mile treadwear warranty and one failed (internal sidewall failure) at ~22,000 miles on the tires. They had worn about 3/32 of an inch (started at 12/32). A 3/32" difference amounts to about 0.60" larger circumference on the new tire.

    At the time, I did not know about the circumference issue, and the shop simply did a pro-rated warranty replacement of the bad tire. After that I definitely noticed the strain in the system, and it was probably a major contributor to the whine that eventually developed in the rear differential.
    2018 Subaru Crosstrek, 2014 Audi Q7 TDI, 2013 Subaru Forester, 1969 Chevrolet C20, 1969 Ford Econoline 100, 1976 Ford F250
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