|Campy Cassette||Bill is in Denver|
Dec 24, 2002 6:17 AM
|Riding a Litespeed Atlas in Denver area. Some of the hills are a bit of a pain with a two ringer up front so I'm tossing around putting on another cassette. Local shop recommends the 13-29 but I've read that it won't work well with the standard sized derailer. Any experience in this direction? 12-25?
Thoughts from the experts would be appreciated. I tossed around going to a triple, but for the few times I need a lower gear it's just not worth the trouble.
|re: Campy Cassette||McAndrus|
Dec 24, 2002 9:22 AM
|From your description, I'm assuming you don't race. If you do, you may want to switch to the triple. You can use a wider cassette: I use a 13-25 for the mountains of South Carolina and a 12-21 for the rolling midlands. When you go to the 13-25 you start to get some big jumps in the gear ratios. For instance, a 12-13-14-15-16-17-18-19-21 is substantially different than a 13-14-16-15-17-19-21-23-25, particularly in the middle ranges.
That said, if you're riding recreationally then the only factor will be the rear derailleur's ability to handle the chain on a 29-tooth cog. The biggest cog I ever ride is a 26 and that puts my derailleur at its capacity. If you plan to go with a 29 cog you'd be best to consider changing your derailleur out for a long-cage derailleur, I think.
|re: Campy Cassette||B2|
Dec 24, 2002 9:49 AM
|I'm currently using a 13-29 with a Record standard cage derailleur. This exceeds the derailleurs specified capacity and although I don't intentionally use the "big-big" combo, there seems to be quite a reasonable amount of capacity "left over" in the derailleur (if I were to inadvertantly shift into this combo). Over 2,000 miles with this setup and no problem here.
|Do you have Centaur/Daytona or Chorus/Record?||PdxMark|
Dec 24, 2002 10:50 AM
|I think it matters which standard sized Campy derailleur you have. I think that a standard Centaur/Daytona derraileur will handle a 13-29, but a standard Chorus/Record is not supposed to (though one reply above says it works).
I have 2 bikes, one 13-26 and the other 12-25. The differences between them are pretty subtle, but the 13-26 is probably a better recreational cassette for me. (It's on my commuter.) Loss of the 12 on the 13-26 is not a big deal for us recreational riders.
13-29 is my fall back plan for the time I do a trip with much more than the usual 5000'+ climbing a day. I might have to replace the derailleur on my Chorus road bike when that day comes, but it's not much more than $100. Looking at the Campy web site, it looks like you can just order the longer cage(?) as a separate part to convert an existing Chorus/Record derailleur, but that part is about $50. I'll just get the whole new derailleur.
|centaur will handle it||weiwentg|
Dec 24, 2002 10:45 PM
|iirc, the atlas is speced with Centaur. the derailleurs on that group are all medium cage, and will handle the 13-29 (not so sure about triples).|
|re: Campy Cassette||GregJ|
Dec 24, 2002 1:56 PM
Poke around at the excellent Campy website. They have a great Q&A directly addressing your issues. Also look at the product info. The Chorus 10 derailleur comes in 3 cage lengths. I have a 12-25 on my bike, but to be honest I don't even know whether I have the standard or medium cage, I know I don't have the long. So if I had the medium I could run a 13-29 if I wanted. That is a pretty low gear and with 10 cogs it is not a bad spread either.
|re: Campy derailer size...||pa rider|
Dec 26, 2002 5:04 AM
|Hi Bill. I guess you may have figured this out already, but I thought I would post a comment anyways.
I'm getting a new bike with the 13/29 rear cassette. I was told they have a universal derailer that would work. What I think they meant was a medium length rear derailer cage.
According to my math I'm pretty sure the long rear derailer cage is for the triple. You just need to decide the front derailer diff and the rear derailer diff to get you max number. I figured (53-39 = 14) + (29 - 13 = 16) = 30. The medium is max 37. With triple it would be (52 - 30 = 22) + (29 - 13 = 16) = 38. The triple long cage max is 40.
Hopes this helps. I would go with the medium unless you plan on putting a triple on down the road and still need to use that 29 gear.
|re: Campy Cassette||ridewt|
Dec 26, 2002 9:32 AM
|I have put a 13-29, briefly, on my Chorus short cage derailleur. It works but I wouldn't really want to ride that way for long. When in the 29, the jockey wheels, or something, rubs and creates some friction. I've also read that the medium cage works with the 29.|| |