Has anyone fitted crossclimate tyres to their Z4? They are apparently a summer tyre with winter tyre rating (?). The reviews look good, and after sliding sideways around a roundabout in the rain yesterday, I have ordered a set for my 2.o Z4 convertible. MY car came with Pzero runflats on the front, and a set of Chinese rubbish. cheapo tyres on the back. The car felt seriously unsafe yesterday, which was the first time in a month I had driven it. It would be nice to use my car year-round!