Just a word on these on initial fitting. I had a set put on my spare set of wheels for a track day. They came with the releasing agent still on them and in the damp it was like driving on ice. Once this layer is gone (doesn't take much, a few miles maybe) then they grip really well. BUT - don't assume you can put them on a road car and drive in the wet without scuffing the releasing agent off of them first. Now to the tires - I ran these on my mini over the winter and other than being a bit lacking grip in frosty conditions early in the morning, they coped fine, even in the wet. Stiff sidewalls and a very 'square' profile, and not the lightest of tires either but semi-slicks/slicks aren't light anyway due to the stiffer construction. On the track they have been fine so far. 2 track days and 1000 miles or so on the road and I've taken 2mm off the fronts (car is 200bhp roughly). I'm sure with some more spirited track work I would expect them to last another 3-4 track days for me at least.