Well, I was riding earlier on my bike (not motorbike, mountain bike) and there was a bump in the pavement, and the bike handle hit against a lamp post as I went past it, and the front wheel, went around the post. I layed it down on the floor, and straightened the tyre up, but as you ride it, it gets stiff in places on the tyre as it goes around. Anyone know how to fix it/what's happened? It's never happened to me before.