Thread: Tire question
View Single Post
#7: 10-04-2012, 10:07 AM
 
 BAC5.2
BAC5.2's Avatar
Title: OTM Dir. of Engineering
Location: Automecca
Car: Rental cars
Posts: 17,912
iTrader: (14)
Send a private message to BAC5.2 Find all posts by BAC5.2 Reply With Quote
Quote:
Originally Posted by dmanaenk View Post
Subaru's official recommendation on circumference difference (1/4") comes down to about 3/64nds of thread depth difference. There is probably some safety margin in there somewhere, so depending on what exactly is 90% new (any my how much did the seller lie) - you might be okay. Basically if new are @12/32nds, and used one is at 11/32nds I'd say you're okay.
Subaru retracted that "official" statement several years ago. The new, official, statement is what I posted above.

Any difference in degree of wear has the potential for permanent drivetrain damage. All 4 tires need to be the same.