AvastThar
new member
Reged: 06/21/04
Posts: 7
Loc: New Hampshire
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I'm expecting a new ride shortly with Campy Record 10 setup. The stock config will arrive with a short cage rear derailleur and a 12/25 cassette. I'm thinking of swapping in the 13/29 for some hillclimbs. Will I need to go to a medium cage derailleur? Thanks!
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Allan
journeyman
Reged: 05/04/04
Posts: 198
Loc: Bds,W I
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The 13/29 cassette combo will not work on the short cage Record derailleur since the range capacity is too large. Therefore you will have to go to the medium cage derailleur if you wish to use the proposed setup for your bike.
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Its time to ride.
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foothillbiker
friend
Reged: 12/20/03
Posts: 25
Loc: Los Altos, CA
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All,
well, I put a 13x29 on my short cage der for the Death Ride yesterday, and it worked just fine.
REgards,
Chas.
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flyaway
new member
Reged: 12/27/03
Posts: 9
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I am using an Fsa micro setup with a medium cage record 10 derailleur. Mixed a 12/25 and a 13/19 to create a 12/29 for the death ride worked just fine. Was able to use poor gear combinations with no catastrphic results. medium cage looks ok (see pics in calfee forum). Got home and put the 12/25 back on, also bought a 36 tooth inner ring for the FSA which will give me gearing almost Identicle to a 53/39 - 13/28 set up. I might get realy stupid and by a short cage derailleur and then only put the medium cage on for rides like markleville
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Max
journeyman
Reged: 12/18/03
Posts: 69
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Yes, you will need a medium cage for long term reliable service, if you use the short cage with a 29 tooth it will only be a matter of time until it breaks.
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MAX
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Allan
journeyman
Reged: 05/04/04
Posts: 198
Loc: Bds,W I
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Basically the reason for using longer cage derailleurs with bigger rear cog combinations is so that the extra length of the cage acts as an additional spring loaded lever to absorb the greater ammount of chain length used with larger ratios.Also if you use a short cage derailleur with a rear cog larger than a 25 you can instantly see the chain wrapping itself completly up under the bottom portion of the 25 and the cage arm being pulled excessively forward as the spring will allow.
Moreso if you use the large chainring with the 25,and you listem carefully when pedalling you will also hear the chatter that goes with this situation and a shift under this condition can eventually damage the derailleur cage.
Why is this such a hard concept to understand and that its easier to just use a longer cage as necessary with wider ratios since thats what they are made for.
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Its time to ride.
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gmason
new member
Reged: 10/30/05
Posts: 8
Loc: Rhone-Alpes, France
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You will be fine with the short cage provided that you do not use the largest cog with the largest chainring. I understand that Campa says no, but they have to take all kinds of dolts into account in their docs for liability purposes. 
I had the same question several months ago when I received my new bike, but it is not a problem. In fact, it even works in the worst crosschaining combos, but it is asking a lot of the pieces regarding wear, so don't do that.
I run a 50/34 and 13-29 combo. I also built a custom 11-29 cassette which I run on my Ventos, and it also works fine.
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gmason
new member
Reged: 10/30/05
Posts: 8
Loc: Rhone-Alpes, France
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Sorry - "Ventos" should be "Zondas" in my previous post. 
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Allan
journeyman
Reged: 05/04/04
Posts: 198
Loc: Bds,W I
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Technically speaking in this situation you can use the short cage too, but then you have to remember to NOT use the largest rear cog with the largest front chainring. Why have ratios you cannot use for the sake of not buying a medium or long cage derailleur that will give you all the ratios you have on the bike.
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Its time to ride.
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gmason
new member
Reged: 10/30/05
Posts: 8
Loc: Rhone-Alpes, France
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Quote:
Why have ratios you cannot use for the sake of not buying a medium or long cage derailleur that will give you all the ratios you have on the bike.
You aren't losing anything. If you want to limit undue wear on the chainrings, cassette, and chain you should not be crosschaining to that degree anyway.
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BlueJays
journeyman
Reged: 09/21/07
Posts: 69
Loc: United States
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The other alternative is just to have a whole climbing-specific bicycle when one knows they'll be riding in very steep terrain! Arrange for a very lightweight wheelset suitable to the rider, a 27-tooth or 29-tooth rear, all mounted on a lightweight frameset 
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frikinspit
new member
Reged: 03/06/08
Posts: 5
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Why would you want to use a short cage with a 29 cog??? I cerainly hope it's not for weight savings. Total weight savings is 9 grams. It may save you .00000001 seconds. Or you could have a mechanical failure and not finish.
Sure it will work for a while in most gear combinations. I could also buy Huffy at TOYS R US and deck it out with campy record. There are many things you can do, but most you shouldn't.
No brainer. Don't do it.
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