I installed a 200/50-17 Metzeler M5 about halfway through last season and I am sorry to report that it is shot after just about 2500 miles which I found strange since I put 4500 miles on the stock M5 190 E-spec and it still had more tread left than the 200/50 does. Those stock E-specs M5's wear MUCH better than than the standard M5's. When I put the 200 on the back I also installed a new E-spec front which still looks great after 2500 miles. I just ordered a 200/55-17 Metzeler M7rr which I am going to try out on the back and I am going to continue to run the front M5. Anyone try M7 yet? They are supposed to wear longer than the M5's, we will see.....