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  1. #1
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    Deore XT with 105?

    Hi all,

    As this is my first time trying to build a bike, I am at a loss.

    I've managed to acquire an XT rear derailleur (M772, super long cage), an XT cassette (M770) and a XT STI brake & shifter combo (M770).

    Next up, when I have the money (time is not the problem), would be cranks. As the rear is 9 speed, would a 105 do? Is it possible to mix the parts in such way?

    The bike will be for my better half and her 110 pound frame does not, I'm pretty sure, necessitate super heavy-duty MTB stuff to last. Oh yes, the bike is to be a 20 kilometers/day commuter.

    Thank you,

    t-hog

  2. #2
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    The 105 crank and the matching road front derailleur may not be compatible with the XT front shifter. Road front derailleurs have different geometry from MTB fd's and the shifters take that into account.

    Also, you cannot use a MTB front derailleur with a road crank as the cage curvature is intended for a 42 or 44T large chainring and is too severe to match the typical 52 - 53T large chainring of a road crank. You would have to mount it way too high.

    Finally, MTB cassettes almost all have an 11T small cog. Can your wife really use a 52x11 high gear? I'd look for a modest MTB crank to go along with your other components.

  3. #3
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    Quote Originally Posted by HillRider View Post
    The 105 crank and the matching road front derailleur may not be compatible with the XT front shifter. Road front derailleurs have different geometry from MTB fd's and the shifters take that into account.

    Also, you cannot use a MTB front derailleur with a road crank as the cage curvature is intended for a 42 or 44T large chainring and is too severe to match the typical 52 - 53T large chainring of a road crank. You would have to mount it way too high.

    Finally, MTB cassettes almost all have an 11T small cog. Can your wife really use a 52x11 high gear? I'd look for a modest MTB crank to go along with your other components.
    Thanks, 'Rider!

    Didn't know those things, although the high gear issue did cross my mind.

    Will look at Deore family of cranks, then.

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