Hi I am writing to ask about my chain. I recently bought a new r1u 700 series. Everything is great smooth ride and enjoying the ride the problem is the chain has started dropping off on any major bumps wether I'm pedaling or not. I don't know what to do to fix this willing to try anything the last time I rode I watched the chain and it was on the bottom of the pedal crank where it started to come off. If I hit a big enough bump it just jumps completely off. Any advice would be greatly appreciated. Jp