Question about Campagnolo Chorus 10 Speed Short Cage Rear Derailleur Campy

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Campag Chorus medium cage rear mech with 13 - 29 cassette

I have a Campag Chorus medium cage rear mech (currently running a 13-26 cassette) but want the option of running a 13-29 to cope with severe hills. However, the jockey wheel fouls the 29t ring - is there any adjustment that will remedy this?

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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

Posted on Jun 07, 2010

Testimonial: "Didn't underste=and most of the solution - but thanks for pointing me to the B screw link."

  • David Dunn
    David Dunn Jun 09, 2010

    Capacity of a rear derailleur is how many links in total (or teeth) it can **** up the slack from. Long cages have greater capacity while short or medium cages have less. This means one has to carefully choose the gearing (front and rear) and how it's used so as not to a) be in a combination that lets the chain hang limp (small chainring and smaller cogs) or b) rip the rear derailleur off the bike (big chainring and larger cogs).

    Typically a compact crankset might have a 50/36 or -34 chainring combination (14 - 16 teeth difference) while your 13x29 cassette has a 16-tooth difference. The maximum total difference this example would yield is 30 or 32 teeth, each of which is well within the derailleur's capacity to manage the chain tension.

    However, if you have a triple chainring crankset you may approach or exceed it. That's why I said you could make gearing choices while riding that would avoid using the cross-chained no-brainer extremes of large-large and small-small gearing; and it would result in a straighter chainline. Google a few of these terms and read up on shiftng effectively.



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The short cage would would up to a 28 tooth but it might be a bit sloppy. I would suggest moving up to the long cage to give yourself a bit more flexability as far as gear ratios is concerned in the rear.

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I have fitted a campag 13-29 cassetteBut now when out of the saddle my chain clicks,do i need to change my rear derailleur size.It is currently a short cage.

Hmm, only out of the saddle? What gear(s)? If only the 29 I'd say the equivalent of the "B-screw" needs adjustment first but if all gears click you probably just have a mismatch between aged chain and new gear teeth.

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I have a 9 speed 12-25 shimano tiagra cassette. I want a gear that is lower than 25 and want to keep the 25. Can I remove the 14 and add a 26 or 27

NO. It's prohibitively expensive to swap individual cogs on cassettes and the ends are fixed anyway.

Look at this picture

The largest 3 cogs are riveted together as are the next 2 cogs.

Cassettes can have up to 34-tooth low gears. 12x27 is a common size. Mountain bike sizing is next and it involves someothing more like 11x32 or 34.

Your rear derailleur, if it's a short-cage, may not be able to handle a much larger cog. Do some online research for the largest cog it can accomodate.

You don't say what size chainrings (or how many) you have. Compact cranksets run 50x34 or 36 up front, which makes a huge difference if you're coming from a 52x42 or 52x39 setup. I converted one of my bikes to compact and it's my favorite hilly-ride bike now.

Consult a bike shop because some special tools and skills are required. And web search for 'how to' just about anything.

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When in the smallest cogs at the rear (the last two) and the smallest front ring the chain rubs against the bottom of the rear mech where the pulley wheels are. How do I adjust please. Campag...

Don't use that combination. Really. It is unnecessary as it duplicates a straighter chainline combination and it's also possible that your rear derailleur can't **** up all the slack chain when using small gears front and back.

Read this:

Jun 02, 2011 | Campagnolo Cycling

1 Answer

I have been given a set of Mavic NKSIUM Race wheels currently fitted with a Campag Cassette. Are these hubs Shimano compatable, as I want to fit a 8 speed Shimano Cassette Ian...

Nope. Campi and Shimano casette bodies are TOTALLY INcompatible, BUT I have had good luck with finding Campi casettes online (eBay) and having no interchange problems between my wheels and Shimano or Campi 9-speed shifters and derailleurs on several bikes. I switch wheels without concern for the other hardware.

Within Campi there may be incompatibilities, though. If your wheels have an 8-speed Campi cassette now I think you'll be ok.

Feb 09, 2011 | Mavic Cycling

1 Answer

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

Campagnolo Record 10 sp. short cage rear drlr.+ 13-26 cassette

You don't say if this happens in the BIG ring, small ring or both. If it's just the big ring I'd suspect there isn't enough chain length.

Cross chaining is unnecessary and bad for your drivetrain. I never go more than one cog past the center of my cassette opposite the chainring I use.

May 02, 2010 | Campagnolo Record 10 Rear Derailleur

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