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Why does my chain drop when already on inner ring??

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Why does my chain drop when already on inner ring??

Old 04-14-17, 11:16 AM
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80sbuttrock
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Why does my chain drop when already on inner ring??

I recently took off my rear wheel to change a flat tubular for the first time in like 5 years. When I put it back on,I started getting occasional chain skip and, more annoyingly, when I shifted from 50 outer to my 34 inner,the chain would not drop when shifting (I have the front deraileur inner limit screw almost rubbing the chain) but it slide ride off when I started pedaling..wtf?? I never had mechanical issues b4: HELP Please (Note: my bike had been sitting all winter-Shimano 10 sp Durace double)
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Old 04-14-17, 07:05 PM
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Andrew R Stewart 
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Well worn inner rings (and middle ones) can more readily drop chains if the teeth are worn out.


This post is a common type. "I never had a problem until I did... and then the ... fails". The vast majority of times the problem possibility has been growing each ride. it's called wear and need for maintenance.


Human perception tends to be incident specific and not able to track the gradual slope of real life.


In the Op's case 5 years of never needing to pull the rear wheel is a great record but a poor indication of the periodic maintenance needed to keep a bike problem free. Perhaps I read the OP wrong, but no rear flats in 5 years is on the edge of the bell curve.


Please provide more info. Am I wrong in my reading? Andy
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Old 04-17-17, 02:42 PM
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The reason I never pulled the rear wheel is because when I switched to tubulars, pinch flats went away.


Anyhow, I just dropped the bike off to a local repair center and they could not get a quick fix..even after a few front/rear derailleur adjustments (which was not really the problem in the first place), I was told I had to leave the bike until Thursday for a more in depth analysis of the the problem (inner chainring chain drop under load).
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