Got a new wheel, installed the sprocket as instructed. The sprocket seemed true when I spun the wheel, both off and on the bike. Also, installed new studs for the motor mounts in the back, tightened the motor mounts. With excitement, I installed the chain and tested it with the bike hung up. The chain comes off at the bottom of the sprocket after a few revolutions of the wheel! What do I do now? It must be an alignment issue, I figure. But how do I align?