Question about Campagnolo Chorus 10 Speed Short Cage Rear Derailleur Campy

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I have a 2001 Eddie Merx with Campy Chorus Group. Bike has been running perfectly, but suddenly it is overshifting when going from the small gear toward the larger gears (only in that direction). After each shift, if I just press lightly on the thumb lever (shifter to go down to smaller gears) it fixes the problem. It's as if it is overshifting by approximately half a shift. Shifting down through the gears (large to small) works perfectly. Is there an easy adjustment to fix this??

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This video shows how to adjust any part of your rear derailleur, but if you skip to 1:55 it shows how to fix your specific problem.

Posted on May 29, 2011


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Bike engine stopped

This problem may have many reason but you can try one of the solutions, when suddenly engine stops and kick rod is going smooth without resistance try push and start by directly in 2nd gear or 1st gear and after it starts keep the engine running by giving small revs for a min....

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Cannot get rear derailer to work properly 24 inch girls evolution

Don't start messing with the derailleur yet! Make sure your shifting trouble isn't due to something else, such as a warped, dirty, or stretched chain, gummed-up pulleys, crud in the cable housing, trapped cable, or a bent derailleur hanger
Clean the chain and the rear derailleur pulleys. Pull the chain away from each pulley, and turn the pulley to make sure it can move freely. A pulley that offers resistance to turning must be replaced.
Now check the cable to be sure it slides freely. Mud and grit within the cable housing, or on a cable-guide, can keep the derailleur from moving a "full gear" during downshifts. If the cable doesn't slide freely in the housing, you may be able to clean or lube it to restore smooth shifting.
Let the high-gear limit screw. In your highest gear on the shifter, and with the chain on the smallest cog, position the derailleur so the upper pulley exactly matches the teeth of the small cog. Run the chain a bit with the front derailleur in the large ring, adjusting the limit screw until the pulley and the cog seem to match perfectly.

Setting the high-gear (small cog) limiting screw.

Once you're sure the derailleur matches the cog, move it just a whisker (1/8 to 1/4 turn) towards the other cogs. (You may need to readjust a bit if you get chain-skip.)

Closeup of setting the limiting screw.

Now adjust the low-gear limit screw. Shift into the lowest gear (largest cog). If it won't go, loosen the limit screw. With the chain on the largest cog (and the front derailleur in the small chainring), adjust the derailleur so the upper pulley exactly matches the teeth of the large cog.Once it's perfect, turn the limit screw so it moves the derailleur a tiny amount towards the other cogs (1/8 to 1/4 turn usually works).

Setting the low-gear (largest cog) limiting screw.

Now shift to the highest gear (smallest cog). Push the shift lever to downshift one gear (go from the smallest cog to the next-smallest). If it doesn't shift, tighten the cable with the barrel adjuster, 1/2 turn counter-clockwise. Backshift and try again. Continue tightening until it shifts. If it overshifts, going from the smallest cog to the third-smallest, loosen the cable by turning 1/2 turn clockwise. Backshift and repeat until it shifts exactly from the small to the next-smallest cog.

Fine adjustment of tension in the derailleur cable.

Now go to the second-smallest ring. Tighten or loosen the cable slightly, until the outer side plates of the chain are just clearing the third-smallest cog. Shift up and down, fine-tuning until you're satisfied.

Checking the position of the chain on the cogs.

Mar 04, 2011 | Pacific International Pacific Evolution 24...

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I have a Campy 10 Speed Shifter, running with SRAM S60 wheels, it causes some problems when upshifting

If you are running a SRAM or Shimano Cassette, then the spacing will be ever so slightly off. If you want to have precise clean shifting then you need to either replace the cassette body with a Campy one and replace the cassette with campy or get a 10-speed conversion cassette such as those from American Classic. Campy spacing on a shimano/ Sram spline.

The wheels in and of themselves should not make any difference.

Another trick for perfect shifting, make sure that your rear derailleur and shifter match - Campy to campy, Sram to Sram as examples.

Jan 02, 2011 | Cycling

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I would like advice on adjusting the rear derailleurs on my Campag Record long cage set. I am very much an amateur, and am not sure which screw/nut to turn and by how much. Thank you.

ok...there are usually 2 screws,one above the other.The top screw normally adjusts the deraileur so that the deraileur does not touch the spokes.the bottom screw usually adjusts the derailer so that it does not go past the smallest sprocket.One way to adjust eg(incase you have clicking sounds as you pedal) is to put the deraileur into the smallest sprocket at the back end.Flip the bike upside down so it sits on the seat and handlebars.Now get right behind the deraileur and see if the deraileur is in line with the smallest sprocket.If it is not in line,then slowly pedal the bike and adjust the screw inwards until you hear no more clicking.If you cannot get into the smallest sprocket,then,turn the screw outwards while still turning the pedals.The deraileur will slowly move outwards until it jumps into the small sprocket and no clicking sound .Vice versa for the top screw.good luck.let me no how you get on

Nov 14, 2010 | Campagnolo Chorus 10 Speed Short Cage Rear...

1 Answer

Campag Chorus medium cage rear mech with 13 - 29 cassette

That's a 16-tooth spread in the rear. The cage can handle 36 teeth of chain length change including the front. That means your highest and lowest chainrings should be within 20 teeth of each other, but I avoid those issues by being careful to find a straighter chain line than anything near a cross-chain, typically not venturing more than one cog past the center opposite the chainring I use. That way I can actually use a shorter chain, too.

Read up on the B-screw adjustment

Jun 07, 2010 | Campagnolo Chorus 10 Speed Short Cage Rear...

1 Answer

How does the break cable go through the shifter?

Go to and click the brake levers of the bike to bring up a list of brake-related info. Select brake levers, which is the first on the list. The Campy levers and cable are the second topic in the article. There are pictures.

Nov 19, 2009 | Campagnolo Chorus 10 Speed Short Cage Rear...

1 Answer

Up grading my down tube shifters to 8-speed chorus brake handle shifters... What kind of ferrules do I need for the shifter/brake termination on the brake levers? Thanks, Robert.


The brake cable generally requires 5mm ferrules, and the shifter cable generally requires 4mm ferrules. Campy routes both of them along the bar, the brake in front, shifter in back. Because the cable housings but right up against the shifter/brake body, often no ferrule is required. I still use them, though, just to have a "clean" joint.

May I ask what you're going to do with the old shifters?

Oct 22, 2009 | Campagnolo Record 8pcs Group Set

1 Answer

My campy shift (right) cable is spliting/frayed and sticks out from under the shifter-OUCH!. Can I pull it out and just replace the cable itself and not the housing? It's a two year old 10 spd. Chorus...

Yes, you can. If you go to and check out repair help at the top right hand of their home page, click the derailleur on the bike and it will take you to a page on the drivetrain. Select shifters and you will find road shifters about 2/3 or 3/4 of the way down the page.

Hope this helps,

Oct 05, 2009 | Clark 's Mountain Bicycle Front and Rear...

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