Campagnolo 11 speed chain skip under load

[ravdg316]

Hey all. I have a brand new Campy groupset installed on my bike. Chorus everything with a super record front derailleur, Dura Ace 11/30 cassette.

I’ve already checked and adjusted for cable stretch. The skipping tends to happen in the middle cogs from either the big ring or the small. I haven’t been able to replicate on the stand. The shifting itself is good. What’s the order of things I should check?

Thanks all!

[Mikej]

What hubs?

[DRietz]

Skipping over the top of the gear or skipping between gears?

I'm assuming it's the latter, in which case the order of operations should be to properly torque your cassette lockring (40nm), check your derailleur hanger, then check cable tension.

[ravdg316]

Chris King with Dura Ace Cassette, 11/30. The rear Chorus derailleur is long-cage

Originally Posted by Mikej

What hubs?

[bigbill]

Is the cassette stacked correctly? I'm running a 105 11 speed cassette with Chorus 11 on my Wahoo KICKR bike and it works well. I did end up using an Ultegra 11 chain.

[m_sasso]

If you have gone over all your adjustments and still skipping I would start out with the easiest option and try a different back wheel, eliminate cassette. Next, I would try a different chain, eliminate bad chain or links......one at a time.

[RonW87]

New chain/old cassette could be the problem?

[AngryScientist]

first thing to check is the chain for stiff links.

agreed to just swap wheels if you have another.

RD hanger alignment too.

[Mark McM]

Skipping only in the middle cogs is usually related to worn cogs (the middle cogs get the most usage, and wear out faster). But you say the cassette is new, so that can't be it.

Skipping behavior that changes when switching between front chainrings is often due to a bent hanger (or sometimes a twisted derailleur). When you move between different size chainrings, the derailleur is pulled forward and backward. If the hanger is bent/twisted, then it will move at angle when it moves forward and back, causing the derailleur to move laterally as well. So if the derailleur indexing is perfectly aligned in one chainring, it may go out of adjustment in a different sized chainring, and the chain may tend to skip between sprockets in one chainring but another.

[ravdg316]

Originally Posted by Mark McM

Skipping only in the middle cogs is usually related to worn cogs (the middle cogs get the most usage, and wear out faster). But you say the cassette is new, so that can't be it.

Skipping behavior that changes when switching between front chainrings is often due to a bent hanger (or sometimes a twisted derailleur). When you move between different size chainrings, the derailleur is pulled forward and backward. If the hanger is bent/twisted, then it will move at angle when it moves forward and back, causing the derailleur to move laterally as well. So if the derailleur indexing is perfectly aligned in one chainring, it may go out of adjustment in a different sized chainring, and the chain may tend to skip between sprockets in one chainring but another.

I should’ve clarified that everything is new but the cassette, which has lots of miles on it. I’m going to replace and test again, as the cassette may be the culprit. Frame should be good to go, as I’ve experienced poor shifting from a misaligned hangar before and its a bit different from this. Shifting is good it’s almost like the chain can’t mesh with the cassette teeth properly under load. Thanks!

[woodworker]

New chain, old cassette is a problem. Most likely the middle gears are worn and aren't playing nice with the new chain as someone indicated earlier. Not unusual.

[m_sasso]

Originally Posted by ravdg316

Hey all. I have a brand new Campy groupset installed on my bike. (CUT)

I assumed you were also on a new cassette, with a new chain.

Characteristic old cassette, new chain mismatch, sounds like the perfect time to go all new.

[Vientomas]

Worn cassette.

[ravdg316]

Originally Posted by m_sasso

I assumed you were also on a new cassette, with a new chain.

Characteristic old cassette, new chain mismatch, sounds like the perfect time to go all new.

Yep! That’s my bad. Forgot about the cassette. That’s the beautiful thing about bikes — it’s usually something simple I overlooked. Thanks!

[ravdg316]

Do you guys think I should swap wheels altogether and go with a Campy splined freehub for a Campagnolo cassette?