I've got a 4 year old 2005 2.5i Z4 that is primarily a garage queen and has under 18K miles. During a special free BMW post-warranty inspection, it was pointed out to me that the rear tires (RFTs)were getting unsafe, particularly the right rear one. A couple of reasons for this (even though I would check tire pressure every month and adjust accordingly-however the tires were wearing evenly and showing no signs of inflation or alignment problems). First, on inital starting, the right rear tire does more work than the left one. And, of course, the rear tires, in general will wear out before the fronts (present tread depth is 6/32) rear drive cars. And another important contributor to excessive rear tire wear is that I didn't rotate the tires.
So, aside from keeping tires properly inflated, I strongly suggest that if you want to keep your tires as long as possible, rotate them. Now, there is another consideration: Could it be that I disliked these RFTs so much that I unconsciously let them wear out sooner than they should have??? Could be, could be.
So, aside from keeping tires properly inflated, I strongly suggest that if you want to keep your tires as long as possible, rotate them. Now, there is another consideration: Could it be that I disliked these RFTs so much that I unconsciously let them wear out sooner than they should have??? Could be, could be.
) i can safely say that they make an INCREDIBLE difference to both the ride quality and handling of the car. God knows how bad it would have been with all 4 tyres the RE050's. 
) but it significantly comromises handling on undulating road surfaces. Needless to say, front end grip on dodgy surfaces, wet or dry is well up 
facelift, with standard suspension and the the RFT's. To a large extent the slighty better tuned suspension, it being softer standard and taller sidewalls mitigate a lot of the RFT issues.