Chain jumps on hills

[jlykins]

Hello, My chain junps off the small chainring when cranking up hill in low gear?<br />
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?<br />
Thanks,<br />
Jeff

[DaveM]

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]

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