Michelin Pilot Sport 4s Update with xdrive

[shawntx]

Finally got my Michelin Pilot Sport 4S tires in for my 650 xdrive 20 Inch staggard factory 373M Wheel setup.

My concern was the front and rear circumference being within the recommended 1% revs per mile difference for xdrive if i went from 275-30/20 Rear and 245-30/20 Front, to 285-30/20 R and 255-35/20 F

So the 'calculated' values are as follows:

275 R 245 F = .96118 % difference
285 R 255 F = 1.0984 % difference

Actual 'measured' difference of the PS4's is
.22598 % difference.

I used painters tape around circumference of all my brand new PS4s and consistently got this measured result.

So the calculated result can be way different than reality. Reality in this case is excellent for xdrive.