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Old 11-30-06, 09:29 PM   #1
sidlaw
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My chain is falling off the back and that is sad

I have a Truvativ rouleur GXP crankset. Whenever I am in the small chain ring and the bigger rear cogs (like the biggest 4), the chain will fall off after a couple rotations of the crank. At first I thought it was the limit screws or maybe the way the front derailleur is positioned, but then I looked over it and they seem fine.

I think that the chainrings may be bent slightly. Are there any other possible causes?
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Old 11-30-06, 11:00 PM   #2
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Are the chainrings bent?
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Old 11-30-06, 11:05 PM   #3
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Are the chainrings bent?
Don't know. I don't have the tool to take the crankset off, so I'll have to wait until tomorrow when I can head to the LBS.

But I have a few friends that are mechanics at that shop and they are baffled
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Old 11-30-06, 11:30 PM   #4
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Doesn't take a tool.

Take the chain off the rings and spin your crank while watching from a fixed point (I like pressing my head to the seat tube and looking down; it gives a stable reference).

If the chain rings are bent you will see them "wobble" while the crank spins. If they are not bent the rings will run true.
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