I've got 090's on both my mc18's. I think they're superb (on the track anyway. not done many road miles). Only thing is on my early model mc18 i can't get the rear right to the edge, took me ages before i realised it's got slightly narrower rear rim Proberly be better with a 140 on that one, But thrashing both bikes round donnington mallory and brands i can't tell the difference.