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Chorus 10speed rear mech(7 posts)

Chorus 10speed rear mechthe flying bean
Jan 9, 2003 4:25 AM
I'm under pressure to fit a lower gear as I have a number of very hilly Audax PBP qualifying rides lined up. I have a standard Chorus mech and am seeking to put on a 28T sprocket (currently 25T). Will the rear mech cope or will I have to fit a longer cage? And this 'cage'- is this the jockey wheel cage and is it something easy to change? (Incidentally, I don't want to switch to a triple)

I'd be very grateful for any comments on this and thanks in anticipation.

The Flying Bean
re: Chorus 10speed rear mechSpunout
Jan 9, 2003 5:06 AM
I use the 13-29 with 53/39 and use the medium cage rear mech. It is possible to use the short cage RD, just make sure your chain is long enough. You will lose some range through lost chain wrap, but it saves on a new RD.

It IS possible, to buy a medium cage only, and retro-fit your existing RD (preferred solution).

I think there are some here who use the short cage just fine, but be careful in your setup and chain length.

BTW, that 39/29 is the bomb for climbing as I also chose that ability (in Chorus 10) instead of the triple.
28T not offered...C-40
Jan 9, 2003 5:18 AM
Campy offers a 13-26 and a 13-29 cassette. The standard cage derailleur is only rated to handle a 26T max cog and has a capacity of 29 teeth. Some folks have been able to use a 13-29 with the standard cage derailleur, but not every frame will position the derailleur properly to allow this. You would have to try it and see is you can clear the 29T cog. If not, a medium cage derailleur will be required.

You should lengthen the chain by 1 inch. This will require the purchase of a new chain. Proper chain length is critical if you use the short cage derailleur, since you are actually exceeding the rated capacity by 1 tooth.
For the TdF climbs last summer . . .Look381i
Jan 9, 2003 5:30 AM
I threw on the standard Centaur RD and a 13-29. The Centaur is designed to handle that range and is a slightly cheaper option if you want to buy a new RD.

As you have probably calculated, the 39-29 combination give you a low gear that is only slightly longer than the low gear on a typical triple set up with a 12-25 rear cassette.

By the way, I liked the 13-29 so much that when I built up a new bike in August, I went with a Record medium cage and 13-29. I seldom use the larger cogs for ordinary rides, but it avoids a cassette change every time I go up to the mountains. Lazy in my old age, I guess.
IF MEDIUM CAGE FITS 29T WHY NEED FOR LONG CAGE?.StevieP
Jan 9, 2003 6:11 AM
I NOTE CAMPAG HAVE A LONG CAGE IN THEIR LINE UP. IS THIS FOR CASSETTES FOR >29t (I.E A MTB CASSETTE)?
Triple.nmGregJ
Jan 9, 2003 6:49 AM
...smart are you in old age, Yoda!! ;-) nmSpunout
Jan 9, 2003 7:07 AM