[driverman]

I've got a 2008 328i sedan with sports package. It has ~85K miles. Front tires are 225/45 17's; rears are 255/40 17's.

Up until this set of tires, the rears always wore out about twice as fast the fronts. On this set of Bridgestone Pole Position S-04s, the remaining tread after 14000 miles is 8/32 in front and 7/32 in back. I took 4 tread depth readings on each tire and they were very consistent.

This is a mystery to me. Why are the rears wearing just a little faster than the fronts? Is it because I've been doing mostly freeway driving since I got the S04s? Would that explain almost even tire wear? Anybody got any ideas?

This raises a bigger question. Why do the rears wear out faster on a staggered setup?

Thanks.