olaf

I just picked up an Avant and the tires are approx 2/3 worn. The previous owner damaged one tire so he replaced it with a new one of the same brand and size. Will the slight discrepency due to tread depth do any harm to the Quattro system?

nvr_follow

be best. I have no actual experience with differing tire sizes, I'm simply going on recommendations from the manual and what others have said on the forum previously.

Shameless in Chicago

I wouldn't worry about it. I had to replace one tire at time before and the diff didn't explode.

olaf

did a little searching - i think it will be okay for a few months - plan is for new tires in spring

cyberpmg

Best thing would be to get another new tire so that one set has the same (new front or new rear).

Merkin

it's only 1.2% rolling difference

olaf

great. where did you find the 3% spec? source?

Merkin

some manual somewhere, might even be in my 88 90Q manual

olaf

So I am looking at a 3/32" difference. I don't think it is going to cause a problem. All four tires are the same Michelin Pilot Exalto A/S.