Originally Posted by somnambulant
my chain seems to have stretched all of a sudden.. what's up with that?
Suddenly in the past week it doesn't seem to line up with the chainring teeth and it's gotten super noisy. I assume that == chain stretch.
Guess I'll pick up a new one!
how long have you had your current chain? do you mean "line up" from side to side or up and down (great language)? if it's not lined up horizontally then that's a chainline issue. have you changed the chain since installing chainrings/cogs? you can always measure the chain to see if it's worn. according to sheldon brown:
"The standard way to measure chain wear is with a ruler or steel tape measure. This can be done without removing the chain from the bicycle. The normal technique is to measure a one-foot length, placing an inch mark of the ruler exactly in the middle of one rivet, then looking at the corresponding rivet 12 complete links away. On a new, unworn chain, this rivet will also line up exactly with an inch mark. With a worn chain, the rivet will be past the inch mark."