Good news and bad news, I just got a 4 year old A1 off a friend of mine for free, I bolted the headtube too the deck, I just mastered Tailwhips, 180's, 360s, and barspins. Badnews, I did a tailwhip 180 and the backwheel's urethane ripped, and now when ever I land on that section it pops off the wheel, anybody know how to fix it??