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PostPosted: Thu Jul 26, 2012 12:11 pm 
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Normally I'd be able to answer this myself but struggling as my rear mech isn't the current one

I've a Campagnolo record short cage rear mech from 2007. I've got a 760 miles charity ride over 9 days coming up and wanted to give myself a fall back hear for the hills as its such a long ride.

My cassette is 10 speed 11-25 record and wanted to know the max cassette the rear mech can handle? Front setup is standard 53-39


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Posted: Thu Jul 26, 2012 12:11 pm 


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PostPosted: Thu Jul 26, 2012 12:22 pm 
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You should be able to get away with a 13-29 although Campagnolo tech docs say you shouldn't - difficultly is can't say with 100% certainty.

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PostPosted: Thu Jul 26, 2012 12:48 pm 
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You'll need the medium cage on your derailleur in order to run the 13/29. This used to be available as a spare part. Not sure if it is still available but you could check. In addition, you'll have to use a longer chain. If you don't change the cage you could still go to a 26 providing the chain is long enough but for one tooth difference it's hardly worth it.

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PostPosted: Thu Jul 26, 2012 12:52 pm 
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I use a long cage campagnolo record derailleur for my 13-29 cassette.

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PostPosted: Thu Jul 26, 2012 1:33 pm 
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monty dog wrote:
You should be able to get away with a 13-29 although Campagnolo tech docs say you shouldn't - difficultly is can't say with 100% certainty.

As you state, Campag say no, but I used a 13x29 on a short cage rear mech for a number of years with a 50x34 compact. I had no issues with it. The only caveat is I'm too old to apply any meaningful power although that shouldn't affect performance.


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PostPosted: Thu Jul 26, 2012 1:42 pm 
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the need for a longer cage is dictated by total tooth differential in the drivetrain, and thus the total amount of chain to take up.

all Campy RD's have the upper pulley at the same distance from the cassette.

with a 13-29 cassette combined with 39-53 chainrings, the total differential is 30, which is doable with the short cage RD, but it's important to get the chain length right.

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PostPosted: Thu Jul 26, 2012 1:48 pm 
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You can run a 29 with conventional crank. You need to test it first and watch the B screw adjustment. There is no need to change the chain length. I wouldn't recommend running it all the time that way, but for your trip, you'll be fine.


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PostPosted: Thu Jul 26, 2012 2:47 pm 
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Geoff wrote:
You can run a 29 with conventional crank. You need to test it first and watch the B screw adjustment. There is no need to change the chain length. I wouldn't recommend running it all the time that way, but for your trip, you'll be fine.


sorry but you just cannot make blanket statements like this. to be safe the chain should be long enough so that the RD can accommodate the new big-big combo. it might be fine as is, it might not, we don't know.

if OP promises never to use that combo he'll be OK, but in the heat of the moment, things happen.

bad things can happen if the chain is not right.

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PostPosted: Sun Jul 29, 2012 4:58 am 
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stella-azzurra wrote:
I use a long cage campagnolo record derailleur for my 13-29 cassette.


I am using the 13-29 cassette with the 53x39 front rings hence the long cage.

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PostPosted: Sun Jul 29, 2012 5:07 am 
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Long cage works but it was really made for use when using a triple crank and the 13/29. With a double crank and the 13/29 cassette the medium cage is optimal.

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PostPosted: Sun Jul 29, 2012 5:25 am 
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Why is the medium cage optimal?

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PostPosted: Mon Jul 30, 2012 8:09 am 
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The medium cage is specifically designed for the 29t cassette. Actually should not be used w a cassette smaller than 26t. Its capacity is fully capable of handling the full range with a double, unlike the short cage which is a bit of a crapshoot when running the 29t.


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PostPosted: Mon Jul 30, 2012 10:13 am 
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I'm another one that got away with a 13-29 and a short cage.


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PostPosted: Mon Jul 30, 2012 3:42 pm 
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Can you use a 53x29 with a short cage?

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PostPosted: Mon Jul 30, 2012 6:10 pm 
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I too run a 53/39 and when I go to the alps slip on the 29 rear and it works just fine.

I don't think you would want to have it in the 53/29 though!

Lig.

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Posted: Mon Jul 30, 2012 6:10 pm 


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