Hi everyone
Im hopping someone can shed some light on this problem.
Ive been hearing a noise when on the middle chain ring and regardless of what rear sprocket, its a sort of a rattle come grinding noise with each pedal revolution I think.
Ive checked the teeth and they look ok the bike has only done 500 miles but incidentally ive only noticed this after the lbs fitted a new bb. Ive also slipped the chain off and the bb does seem smooth and noise free so not sure what it can be ??.
Any help would be much apreciated
Im hopping someone can shed some light on this problem.
Ive been hearing a noise when on the middle chain ring and regardless of what rear sprocket, its a sort of a rattle come grinding noise with each pedal revolution I think.
Ive checked the teeth and they look ok the bike has only done 500 miles but incidentally ive only noticed this after the lbs fitted a new bb. Ive also slipped the chain off and the bb does seem smooth and noise free so not sure what it can be ??.
Any help would be much apreciated