Originally Posted by martin_j001
The best way to find a stiff link is to just put the bike in a stand, and spin the cranks backwards and forwards until you see what is causing the problem. It could be your derailleur pulleys as well, if those are older and not in good condition--they could stick causing tension that pulls the chain into a different gear. Just spin the pedals while watching the rear derailleur and chain and cassette for a while, and see if you notice anything thats not moving in a perfect circle or parallel--you should be able to find the problem.
Yeah, been doing that... replaced the idler wheels on the drailleur with metal sealed bearing units... mindful of the spacing. I checked the chainline last night... just to make sure... arrow straight. Watching carefully while working backwards for any thing that seems different.
I'll try some different lighting on it and see if I see any links jump... sometimes a spot light instead of bright flourescent lighting can "enhance" a problem.
Thanks