I have a 21 speed mountain bike, and something seems to be wrong. As I am running through the gears and have the gear in front set up to the largest one, the amount of force I put in does not make sense. In the rear, gear one two and three gradually increase the amount of force necessary to move the pedals, but as a i shift from 4-7 it seems like it is back into gear one and i notice no change in difficulty.
any suggestions?
thanks
any suggestions?
thanks