's Forum Archives - Components

Archive Home >> Components(1 2 3 4 5 6 7 8 9 10 )

Chorus med. cage?(12 posts)

Chorus med. cage?Crankist
Sep 17, 2003 5:54 AM
I was unable to climb some CO "hills" with a good rhythm while remaining seated using 39/25. Instead I was out of my saddle for miles in 39/17 or 39/19 with crispy legs.
New to Campy. If I move to 13-29 cassette is the medium cage der. necessary and (if so) would the MC also work with 11-23 and 12-25?
works fine with the 11-23 and 12-25 (as I use)...Spunout
Sep 17, 2003 8:26 AM
The word here is that you can use the 13-29 with the short cage RD. Just be careful about using the big-big combos and check your chain length, run as long a chain as you can.

Using the medium cage with all kinds of cassettes doesn't pose any problem.
Campy says need med cage for 29 cogPdxMark
Sep 17, 2003 9:11 AM
CHORUS™ rear derailleur 10s short cage:
With double crankset: min. sprocket 11; max. sprocket 26; cap. 27; max. front diff. 14

CHORUS™ rear derailleur 10s medium cage:
With double crankset: min. sprocket 11; max. sprocket 29; cap. 30; max. front diff. 14 With triple crankset: min. sprocket 11; max. sprocket 26; cap. 36; max. front diff. 23
Any visual difference between standard and medium cagesokratikus
Sep 17, 2003 9:53 AM
If you simply eyeballed the standard and medium cages, could you immediately tell the difference?
Any visual difference between standard and medium cagePdxMark
Sep 17, 2003 10:01 AM
I think this is the difference:

55 mm - outer plate for short cage
72.5 mm - outer plate for med cage
Any visual difference between standard and medium cageRusty Coggs
Sep 17, 2003 12:30 PM
And that difference has to do with wrap capaacity.
Any visual difference between standard and medium cagedivve
Sep 17, 2003 10:18 AM
Yeah, andRusty Coggs
Sep 17, 2003 12:33 PM
Campy and shimano both say alot of things that are not necessarily true when it comes to actual application.
Special precautions...C-40
Sep 18, 2003 4:55 AM
The only way to know is to try it. The problem may not only be a lack of wrap capacity, but a failure of the derailleur to clear the largest cog.

With only 27 teeth of wrap, the short cage is 3 teeth or 3/4" short of the wrap needed to use the entire range. With the chain set to the proper length, so it does not hang loose in the little ring and smallest cog, it MIGHT bind up if you were to shift into the 53/29 combo.

Depending on the chainstay length on your bike, you might find that you can get adequate chain tension in the 39/14 combo and not bind up in the 53/29.

I have the same problem riding the mountains around Denver. With continuous climbs of up to 12 miles, it's not the how steep the grades are, but how long. When riding a double, if I can't stay seated, I have to shift up to a 39/21 and stand at a low cadence to get up some of the steeper sections. With my heart rate running 175-180, standing for a mile or more isn't much fun. My triple bike works much better.

I see lots of young studs riding High Grade Road with 23 or 25 tooth low cogs. Rode behind some shaved-leg racers yesterday and was really impressed by the fellow ahead of me riding about 14 mph it a 19 or 21T cog. Then I looked further up and noticed he was in the 53 chainring! I was riding a 30/21 at a much higher cadence.
but you wouldn't use those gear combos anyway.rufus
Sep 18, 2003 6:46 AM
at least not the 53-29. if you avoid the extreme cross-chaining combos, the short cage derailleur should shift fine. it'll shift the 13-26 campy cassette, so just avoid the 53-29 and you've got the same setup.
Thanks all for the really useful answers.Crankist
Sep 18, 2003 5:55 AM
Chain wrap won't be a problem, but excessive tension may be.
I'll try the cassette only and add the der. if cog clearance or tension probs. appear. Set-up presently shifts so well that I hesitate to make a der. change - and for that matter wonder if the med. cage may be a bit slower shifting.
The cage is a separate piece, same guide pulley position...Spunout
Sep 18, 2003 7:16 AM
so it should not affect shifting at all.