I am at a loss here and any help would be much appreciated! I am trying to work on a ~2002 9 speed Ultegra 6500. I have replaced all cables, cable housing, and barrel adjusters. I have replaced the entire drive train (chain, chain rings, cassette, jockey wheels, and bottom bracket), re-aligned rear derailleur hanger, reset limit screws, and seem to have cable tension where it should be. On the surface every thing seems to work smooth if. I ease into things everything is really smooth the system can take any load. However if I start pushing the torque the chain starts to skip on the cassette. Is there anything else I should take a look at?
Thanks!
(
!?!)