I don't break anything on my trials bike really, worst is an exploding try-all free wheel that was two months out of warranty and a pedal body. My mountain bike is a whole different story though, broke a set of rockshox argyle forks, loads of chains, mechs, shifters, avid juicy 3 brake lever (doing an endo, was ultimate ggnaarrrrrrr!), bearings, a tyre, things like that.