frogman

Trek with Campy 10 speed drive train. Ergo brifters. Replaced the chain and cassette. Having trouble adjusting the rear derailleur indexing. The front derailleur indexing was adjusted and is fine. When I shift up to the largest sprocket the chain goes up one by one pretty well. When coming down from the largest sprocket one at a time from the biggest sprocket it skips a sprocket coming down. I have been playing with the tension adjustment and can't seem to get it right. Whats the trick to get it dialed in ?

fietsbob

My # 1 on indexing is the derailleur hanger alignment ... new 10 is more critical than old 5 x 2 10 speeds..

onsay99

New chain and cassette were mentioned. I would strongly recommend checking the rear
gear wire. On my ergo 10 bike I replace the rear gear wire with a fresh campy gear wire
at least once a season, and fresh campy gear cable housing about once every 4 or 5 seasons.

Also, the ergo mechanism should be serviced with fresh lube, g springs, and spring carriers
as needed. The beauty of having older serviceable shifters.

frogman

Thanks for the tips guys. I will check the derailleur hanger aligment and I didn't mention that I installed new shift cables and housing.

shelbyfv

In addition, check that the limit screw for the big cog is not too tight. If you have to force the chain onto the big cog, against the limit, it can spring down when released.

Drew Eckhardt 

If the shifter skips a gear, replace its G-springs and carrier.

If you shift through two positions before it moves to a smaller cog, replace the shift cable (which is probably frayed) and housing (noting the rear loop should be at least 330mm long). Under cable routing having shifters level with the bar tops cut cable life in half. Cables can fail in under 2000 miles when you shift like you have ADHD. Housings last longer, but go high friction in about two cables and its simpler to just replace them at the same time.

Hanger alignment could also be an issue, although I'd bet on one of the first two causes which are common.

dedhed

https://branfordbike.com/ergo-shifter-parts

frogman

Thanks for the info Drew,
I replaced both the cable and housing. Sounds like the G-springs and carrier are suspects as you said. I have had the Ergo shifter for a while now, probably a good idea to do a rebuild.
It has been very reliable but they don't last forever. At least it can be overhauled unlike Shimano which would go in the trash can.

frogman

Thanks dedhed !
Very timely. I am planning on doing a rebuild now and the Branford Bike resource for the Campy parts is super !

frogman

Thanks dedhed !
Very timely. I am planning on doing a rebuild now and the Branford Bike resource for the Campy parts is super !

zacster

Before you go tearing apart the shifter, count your clicks and watch your cable with the bike on a stand. If the cable is moving with each click, and you get 9 clicks, then it isn't the shifter. You'll know when you need to replace the G spring when it shifts without clicks. It's not that it'll hurt to replace them, it just may not fix your problem. Before I replaced mine the shifting had become soft and after they shifted like new again. I had Branford rebuild the shifter after a crash and they did a great job but 13 years later I needed to replace the springs and I did it myself.

And remember the Campy secret handshake! What is it? Shh, it's a secret.

Homebrew01

It may be as simple as a burr or rough spot at one of the cable housing ends, causing extra cable friction.