[s-cars] Question on tire tread depth tolerance..

[Postupack, Jeff]

S-Car list?:>

I drove to a regional tire chain today requesting  mounting 2 Michelin
PS2's 
Size is 255X40 ZR17.

Reason being I hit a road hazard and damaged one of 4 Sumitomo's.

This would give me 2 Michelin's and 3 HTRZ II's Size is 255X40 ZR17 for
the moment.
Since I store the S4 in winter, not a problem right now. I did not
measure tread depth, yet.

The Tire store manager did not want to mount the (2) due to variance on
the tread depth exceeding the Audi recommendation for 
Quattro's.

She told me Audi specifies 1/32 " tire to tire variation maximum and
does not want the liability of drive train damage due to differing
tires.

1/32 nd variance seems kind of excessive to me.. But tell me please

If you guys mangle 1 of your summer tires, do you replace all 4?

What rules do you live by WRT tread depth variation?

Jeff Posto