So thats why I lock up my rear at least twice a week! Thank you Used to scare the hell out of me but now I just think "oh there it goes again" Mine seems to lock up at really slow speeds with only 20% rear being used but the clutch at that point is fully in. I hope your taking the piss otherwise that's just bloody dangerous...at least it would be for me I've only locked my wheel up 3 times in emergency braking situations. What's funny is that every time I hit the rear brakes, gently squeezed the front, and pulled the clutch in to prevent the engine stall! It made sense to me at the time but having said that, no one taught me otherwise. Now I know better