sometimes when i try to do the rocket manual (peg wheelie) my left leg (the one that stays on my peg, my right one being in the air) scrapes against the tire, leaving a huge scratch on my leg. It hurts really bad, and I dont know what im doing wrong? someone please help. Im considering using shin guards turned to the side a little to work on them until my leg heals, but i need to know how to do them the correct way, why is my leg scraping? any tips?