Was riding last Tuesday afternoon, comming out of a corner, on the 426 gas, when all of the sudden the bike skidded (rear wheel locked up), looked back, thought the chain may have come off. Sure enough it did, looked even further back- no sprocket! Rear hub bosses brock off, sprocket now bent and in two pc's. O-Ring chain tweaked. Sprocket was a Renthal. WHAT WENT WRONG! any sugestions?