This bike has been giving me trouble. I'd changed the rear wheel and hub already with no problem, other than having to put in two spacers.
After much deliberation I changed the 7 spd chain and cassette, then the problems started. The new chain jumped in the smallest gear when under load.
I straightened the gear hanger, which had no effect.
Investigations revealed the chain always jumped one link after the joining link. The chain is a new 6-8spd chain. This particular design has a rather bulky looking link piece, so I swapped it for a KMC chain.
It still jumped.
I swapped the cassette.
Still jumps.
How Specific are KMC chains? I'm using a theoretical 8 speed but I'd expect that to have a little more leeway on a 7 spd system, not less. I have a Shimano 6-8spd chain as a last resort.
Other than that I can only think that the spacers are causing problems, these being the only thing I haven't changed. Has anyone else found something similar? How did you solve it?
It is depressingly similar to the unsolvable jumping I experienced on a 9 spd cassette a few weeks ago. In that case I changed the whole thing to an 8 speed and all was well.