P3D- so 18" Aero rims? How many miles did you get out of the first set?
If you replaced one and not the other you're not rotating, I assume?
I replaced the 18" on my AWD at 19,000 miles with 18" PS4S. I rotated them a lot to get that much out. I got them to near 2/32" square and then ran the rears down to barely discernible when running finger tips over them (don't do this at home, kids!
) The PS4S are now past 26,000 miles and still legal-ish, though right at the 2/32" edge so I'll soon be swapping on something passable for trips North this winter (probably a set of Extreme Contact DWS 06, I expect to get them balanced and installed at around $200/each). Clearly under strong acceleration and cornering the OEM MXM4 aren't up for our AWD's power and weight.