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jlykins · Jul 4, 2009 01:58 PM

Hello, My chain junps off the small chainring when cranking up hill in low gear?
I'll be standing up cranking pretty good all of a sudden the gears/chaing get tight and then the chain jumps off? (Shimano Ultegra) any thoughts?
Thanks,
Jeff

DaveM · Jul 6, 2009 08:29 AM

Probably worn chain/cassette/chainring. What do you mean the chain "gets tight"? Maybe the derailleur is mis-adjusted and knocking the chain off to the inside?

thepinto201 · Jul 19, 2009 02:03 PM

I might be having a similar problem, but on my mtn bike.
http://forums.bicycletutor.com/topic/740
Is your problem anything like this?

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Chain jumps on hills