I set the toe & camber to BMW minimums when I installed the Vred Ultr Vorts a year ago, 15k miles of driving (hot lapping Sebring track with 5 in the X included) and they measure over 6/32ths in all rain grooves on the rears.

At that wear rate I expect over 40k miles out of the rears.

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'03 X5 4.4 Sport, last of the M62s (8-03 build date)
I believe in deadication to craftmanship in a world of mediocrity!