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  1. #1
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    mountain derailleur

    I have a bianchi axis an older model and i have xt in the back, whats are the advantages of road derailleurs is it just the lighter weight and the lighter cassette, should i consider switching everything works great so i have a hard time wanting to change anything, I like high cadences and with a 110mm bcp crankset i think i'd have a harder time finding chainrings to keep my high gear ratios

  2. #2
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    Fellow Axis owner

    I have an 03 Axis with an XT rear/ultegra front der. I have a friend with a Cross Veloce, and I have ridden his bike quite often---he has the Campy parts. I didn't notice a huge improvement. Besides they look similar with an inch of mud on them!

  3. #3
    Senior Member sfcrossrider's Avatar
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    I have an XT (will replace with a Durace) RD on my cross bike. The advantage to a road der. is chain slack. With a short cage RD, you can run less chain links, reducing the chance of chain suck.
    Quote Originally Posted by BikeIndustryGuy View Post
    I guess the feel good aspect of this story is that the perpetrators did this as a couple. It's nice to see people coming together with a common love of cycling and assault.

  4. #4
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    The mountain derailleur allows for a wider gear range in back, or so I'm told. I also suspect (but have not looked up numbers to prove it) that the mountain parts are cheaper, as I've most frequently seen that setup on lower-priced CX bikes (ie Axis, TriCross Sport).

    Not that there's anything wrong with it, though. One of the best (and fastest) bikes I've ever ridden was had an XTR in back, Dura-Ace in front. And Sora STI brifters. But it worked, and well. (and, no, it wasn't mine)

  5. #5
    ROM 6:23 flipped4bikes's Avatar
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    What trick said. Don't get hung up on mtn vs road derailleurs. A lot of it will depend upon what gear range you want to run and whether you have a double or a triple crank.

    Somebody correct me if I'm wrong but a believe a short cage RD has a 27t limit...
    Every time we let a vehicle pass there is a little bit of compromise. But compromise allows the city to function and allows cyclists to function in the city. The trick is not to eliminate compromise but to learn how to work safely within it.

    --Robert Hurst

  6. #6
    Double Secret Member CaptMatt15's Avatar
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    im pretty sure you're right on flipped, i've got a short cage w/ a 25 and it wont take much more - so i think 27 is its biggest allowable.

    the reason that people go to mtn rears from long cage road rears is capacity, so it can take up the chain slack from a huge drop in chainring size or if they are running like a 11-32 or something cassette
    2007 Redline Conquest
    2004 Fisher Marlin

  7. #7
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    "Somebody correct me if I'm wrong but a believe a short cage RD has a 27t limit.."

    Pretty close. A 27 is the largest "road" cassette that Shimano makes but a short cage derailleur will handle a 28 for sure and I've heard that you can run a 30 if you're careful about shifting (no big - big combo).

  8. #8
    Senior Member Iffacus's Avatar
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    I used to run a 28 tooth sprocket on my MTB with an Ultegra shortcage rear mech without any problems. Also I have no problems running a 28 sprocket on my cross bikes with Campag Veloce or mirage rear mechs
    Prerace, I use a misplaced faith in my innate ability, with a dose of needless optimism. For recovery, I use self-delusional techniques.

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