Hi,

I am having 2 problems with my drive train. I am not sure if they are related.

1. The chain has repeatedly come off my inner chain ring when I am one of by largest cogs in the back. This has happenned a few times when I was climbing a hill. I checked and the front derailler appears to be adjusted properly.

2. The chain keeps wanting to move from the largest cog to the next largest, if you pedal backwards and, when you pedal foward, it goes back to the largest cog. If you keep pedalling backwards the chain catches on the derailler. When pedalling fowards, it sometimes goes goes to the next largest and then jumps back up to the largest.

My bike has been into the LBS several times and no fix. At first, I thought that a link was jammed on my chain or that the chain is twisted. LBS claims not.

I am riding an old Cannondale 3.0 frame with a 20-year old 8-speed Dura-Ace derailler. The chain is an 8-speed chain. The frame needed to be spread to take the 130mm hub, but I have never had a problem with it.

I am not sure what is happenning but would appreciate any help.

Thanks,

David