B
bob a
Guest
Are you letting up when you shift ? You can't shift gears when you are pedaling hard. The chain tension is controlled by the rear derailleur and should not be anything to worry about. If the chain is coming off the smallest sprocket the high limit screw needs adjusted. It will be marked with a "H" on the rear derailleur and it prevents the chain from moving too far to the outside. You can turn it in 1/2 turn and try it, if it wont go into the 8th gear or jumps back out you went too far.