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  1. #1
    Luis Pacheco
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    Mountain bike cassete on road weels

    Dear Friends,

    Will a mountain bike cassete fit in a shimano 550 road weels?

    Mountain bike components are much easyer to find here. I also would like to have more than the 23 road cassete I have in the old road bike I am rebuilding. Crank is 39/52.

    Should I use a mountain bike rear derailleurs or should I use the Tiagra short cage I was planing?

    Thank you for any help.

    Regards,
    Luis Pacheco

  2. #2
    biked well well biked's Avatar
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    Yes, it will work. You'll need a mountain bike rear derailleur because the largest cog will likely be too large for the road derailleur to work without the upper pulley bumping into the large cog. Combined with your front gearing, either the GS or SGS mountain derailleurs should work. The SGS models have the longest cage, but since you're running a double crank, the GS models should work fine also. You'll also need a longer chain so it's long enough to cover the big ring/large cog combination (plus one inch)-

  3. #3
    Luis Pacheco
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    Thank you for the quick information.

    Best regards,

    Luis Pacheco

  4. #4
    Senior Member Bill Kapaun's Avatar
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    You should be able to easily go up to a 27T cog without having to change the RDER. Maybe 29-30??

  5. #5
    Bike Builder ruppster's Avatar
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    If you use a mountain bike cassette (32 tooth and up) you will need a mountain bike rear derailleur. I have done it to 2 bikes, a Surly Cross Check that I use for some light trail riding and a friend of mine's Cannondale. In both cases I replaced the Tiagra rear with a Deore rear, because of the pulley bumping well biked described. BTW both bikes shift as well with the Deore as they did before.
    Last edited by ruppster; 01-12-08 at 03:42 PM. Reason: spelling

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