Join Date: Aug 2011
Location: Oklahoma City, OK
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Think my derailer needs adjustment?
I just had some fenders put on my bike, and the tires replaced. Since I got it back, my rear derailer isn't shifting right. It's fine on the small chain rings, but as I move up, it gets finickier and finickier. The 4th chainring is where it gets weird. Shifts slowly, and as I go up, the derailer bounces like the chain isn't completely seated, and sometimes bounces back and forth between rings a time or two. Once I try to shift it to the largest ring the chain never completely seats onto the teeth and bounces back and forth between them.
I read the Sheldon Brown article on adjustment, but I'm not entirely sure if I need to be looking at the indexing adjustment or the angle adjustment. I checked to make sure the hanger wasn't bent, and everything appears to be in order to my untrained eye. I do know they had to fit a funky spacer onto the back front derailer to make the fenders fit(The shop was cussing Cannondale a lot, apparently) but the front gears shift fine, and I can't tell if the angle of the chain as been altered.
While I could take it back to the shop and make them fix it, I would rather figure it out on my own because A)They're a bit slow and B)I ride to work on this sucker, and they aren't open tomorrow.
If it matters, the rear derailer is a Shimano Altus, the cogs are Sunrace CSM668, 11-32, 8 Speed and the shifters are Shimano Aceras(According to the Cannondale site).
Any advice would be appreciated!