Ive been having a lot of problems with my drivetrain lately-first the chain falling off a million times a month, but Im tightening the axle bolts very tight..chain has good tension but then over short period of time having the chain falling off again. I had someone at my LBS tell me that KMC chains are garbage and they stretch a lot...so would anyone agree with this statement?
Now it seems that my bottom bracket might be wacking out on me? The cranks seem to be able to give a tiny bit, and have some movement to them (the entire crank-not just the chainring). Im fairly sure it is not an installation issue because Ive had several people I trust handle my bike with me and everything has been done correctly.
Had someone else tell me that it's also possiblethat my chainring isn't true? basically, its been a headache, and when Im riding, I feel like my pedal strokes aren't straight.
So...after all this, Ive deciced to get a new bottom bracket, chainring (or crankset...this IRO one I have has been on this bike for many years) and rear cog.
So would anyone suggest that I change just the chainring or should I just buy new cranks altogether? Ive been debating on just switching these ones out anyway, and now that Im having all these problems, Im leaning towards it instead of just a new chainring.
Also getting a new BB-Whats the difference between all these different bottom brackets? And how is one better than another? Any suggestions for an affordable one?
Any advice or ideas on what I should be doing to get everything on the bike running smoothly?
EDIT: This bike feels like Im pedalling on water, the strokes seem straight for a while, and then lobsided.