Hmm, yeah I've noticed my handlebars shake a fair bit at about 70-80k/hr. Once I go past it though it smooths out again. My guess is it could be due to the tyre (bt090) being quite worn. It's still got another race left in it though. I might put my spare gpr70 on the front to see how that one goes. But that wheel's been involved in a pretty decent crash. Hope its still round.