Tire Tread Depth Difference in Tires

[common-sense-answer]

@msiverson

Can anybody point to authoritative evidence that I should also replace the other three tires? Or that all four tires should be within some range of tread depth? Then I will negotiate with the insurance adjuster accordingly.

https://www.tirerack.com/tires/tiretech/techpage.jsp?techid=18

All-wheel drive and tire replacement

Subarus seem particularly sensitive to mismatched tire diameters. We’ve seen several posts here from Subaru owners with ruined differentials due to that problem. Honda CRV’s have a different AWD system and don’t seem to be prone to that issue, though. I have a '99 CRV and the owners manual does not even mention any need to match tire diameters.

CSA