Subaru tire circumferance

subaru

#1

I own an 02 subaru forester. my dealer told me the front tires have an inch difference on their circumference and this can ruin the differential and that i should get four new tires immediately, or get the larger tires buffed to the smaller tires size. I have plenty of tread on all four. My question is, how imperative is it that i fix this problem


#2

They should be about the same circumference.
Is there a particular reason you took the car into the dealer and for them to measure tire circumference?


#3

i took it in for an oil change. two of the tires were bought a year ago, the other two are about four years old, the dealer noticed that and measured them. all four are 205,s.


#4

The dealer is right. That AWD can be seriously damaged by running with even a small difference in circumference. It is possible to shave a larger tyre down to match the smaller ones.


#5

Replace all four ASAP.

Hopefully you have a manual transmission which is more tolerant than the automatic due to differing AWD.


#6

dealers recomend keeping 1/4" or less in circumference, however, variations of even up to a 1/2" is quite normal from tires bought from the same manufacturer ,at the same time. Unequal tire pressures can easily cause a 1/4" difference in circumference. Shaving or buffing a tire costs upward on 35 to 40 dollars, so it hardly seems worthwhile to make a new tire smaller to fit. I do not know repair stats on subaru differentials due to unequal circumferences, but it should be very high for not many people would follow these though guidelines