my brother has a ccm m375 or something like that and he and his friend built a jump in the backyard....it starts by you goin down a big hill get your speed up then you hit this wooden jump it was 5 feet high and the landing ramp was 8 feet away but his bike after about 10 jumps was trrasshed.. his handle bars where bent his crank fell off and he cracked the frame.....the bike costed him like 200 and it was no good already..the bikes are not designed for any kind of jumps or mountain biking