whats up, i'm new to this sport and i really enjoy it. I recently(3weeks) bought a an 08 trek 4300. i love the way it rides but....just this weekened i did some trails and ate it a few times though. not sure if it has to do with the size of the bike. some experienced bikers mentioned something about the bike size. i dont know much about bikes i am 5'9 and the bike store sold me a 19.5 inch frame.is that going to be a problem?? i can't exchange it cause it took some wipe outs so it doesnt look new.