Quote Originally Posted by snyderd25 View Post
I had two flat tires and some major shifting problems resulting in lost and jammed chains.
Are you waiting to downshift until you are really mashing the gear? Downshift before the hill and keep spinning. The chain has a hard time moving to the lower gear when it has a great deal of tension on it. I suggest practicing on some small hills. Yes your bike may need some adjusting as well but I know if I wait to long to downshift as I am climbing I will end up dropping my chain.