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  1. #1
    mtbr member
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    Road rear derailleur with 30T cassette

    I am looking at using a road rear derailleur like a 105 or Ultegra on my commuter bike. But most of the literature says they can only handle a 27t cassette. I thoink a lot of the cyclocross guys use road drive trains with MTB cassettes.Does anyone know if they will work a 30t cassette? What will happen with this combination?

  2. #2
    Xtreme Lounger
    Reputation: steiny's Avatar
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    It will work fine. I use an Ultegra r/d on an 11/34 cassette. Just turn the b-limit screw way in so that the top jockey wheel doesn't ride on the biggest cog.

  3. #3
    Nouveau Retrogrouch SuperModerator
    Reputation: shiggy's Avatar
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    Quote Originally Posted by rc51kid
    I am looking at using a road rear derailleur like a 105 or Ultegra on my commuter bike. But most of the literature says they can only handle a 27t cassette. I thoink a lot of the cyclocross guys use road drive trains with MTB cassettes.Does anyone know if they will work a 30t cassette? What will happen with this combination?
    Works fine on a mtb frame. The hanger length spec is longer than road hangers (though some companies ignore the difference).

    I am currently using a short cage road RD with a 32T cog on two of my mtbs.
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