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Why does a bike chain fall off the second sproket.

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Why does a bike chain fall off the second sproket.

Old 07-07-06, 04:17 AM
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Why does a bike chain fall off the second sproket.

When riding my commuter bike, when shifting from the granny up to the middle chain ring; often the chain misses the sprokets and temporary lodges between the middle and largest gear. Not engaging either. Has the effect of causing no tension being put upon the pedal.
With a chain checker, the chain is half way to the point of being too stretched. Still within tolerance.
The chain was installed by a bike mechanic at a shop I trusted. Been doing this quite awhile.
I have to either take the chain up or down one gear and re-engage it on the middle ring to make contact with the gear's teeth. Any suggestions as to why this happens.
I will need to replace this soon. I trust my mechanic put on the right sized chain? Seems initially it was not a problem.
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Old 07-07-06, 05:23 AM
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Sounds like an FD indexing problem--too much tension causing overshifting. You may be able to fix it yourself by tweaking the barrel adjuster at the shifter for the FD.
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