Originally Posted by Crawdads
All the Diffs care about is wheel diameter/revs per mile. (Going off of REAL measurements, not the size printed on the sidewall)
A matched set of tires is preferable, as they will wear in a consistent fashion...but Diffs can't read, so they don't care what brand the tires are.
Running tires that have the same dimensions, but different tread will not 'mess up your diffs'...the difference would be insignificant.
Still not buying it. I know diffs can't read, but if you have 2 different sets of treads running, it's going to be working to figure out why there's better traction in the front or back 100% of the time. I think it's just not good business to run different tires on any AWD car.