Getting a dura ace 7800 derailleur to work with 10 speeds I have a bike set up with a dura ace 7800 derailleur, specifically listed as a 9 or 10 speed model. I am interested in getting it working in the 10-speed configuration. Two things:


I remember reading somewhere that you have to rout the cable a certain way to get it to work with 10 speeds, but I can't remember how to do so.
I can't get it to rest in the bottom gear even when the limit screw is all the way out and the cable isn't attached. I can easily force it into place, though. I am considering taking out a spacer from behind my cassette that the instructions said I would be needing.


Any advice?
The Dura Ace 7800 rear derailleur has two different positions for the pinch bolt/clamp that holds the cable in place.  One of these positions will limit the derailleur's range, and make it incompatible with 10 speed systems.

If you loosen the bolt, re-orient the clamp, and tighten again, it should work on your 10 speed system without any problems.