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Chain jumps on hills
#1
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

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#2
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?

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#3
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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