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  1. #1
    EEB
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    Shimano XT front/rear derailleurs

    I been doing some upgrades to a friends MTN bike. Got all the other stuff done and it and it made a big difference with the bike. He now wants to change the front/rear derailleurs to Shimano XT. His rear derailleur is bent and not shifting right. Right now he has a Shimano Deore RD m510 on the rear. Not sure what the front has but pretty sure it's a Shimano Alivio M410. I'm in Florida right now so can't check to make sure until I get back. Looking at the XT derailleurs, I'm a little confused at which model to order for him. From the research I did it looks like the 510 is a long cage but it looks like their is 2-3 long cages available for the XT's. What is the difference between the long cages and what model should I get?

    Thanks

  2. #2
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    Reputation: Bikinfoolferlife's Avatar
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    The three current versions of the XT rear derailleur are the M770, a low normal (or rapid rise) type; the M771, a high normal type; the M772 the shadow high normal type. The M510 is a high normal type, most similar to the M771. They'll all work, just depends on what features you want.
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  3. #3
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    The Wikipedia article on Derailleurs does a good job of explaining the different modes and cage lengths. I highly recommend reading it:

    http://en.wikipedia.org/wiki/Derailleur

  4. #4
    EEB
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    Thanks

    What was the last model that still had the barrel adjuster on it? the 760?

  5. #5
    MTB B'dos
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    YES.

    Quote Originally Posted by EEB
    Thanks

    What was the last model that still had the barrel adjuster on it? the 760?
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  6. #6
    EEB
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    Was looking on Jenson USA and for the M771 they have 2 listed. The GS and SGS. Did some research and looks like the GS is medium and the SGS is long, right?


    I just checked his bike and the front derailleur is the shimano alivio FD MC18. So that would be a top swing front derailleur. Which would be similar to the shimano XT 770, right?

    It looks like he is going to drop the $$$$$$$ off tomorrow so I want to make sure I order the right parts.

  7. #7
    bi-winning
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    Quote Originally Posted by EEB
    Was looking on Jenson USA and for the M771 they have 2 listed. The GS and SGS. Did some research and looks like the GS is medium and the SGS is long, right?


    I just checked his bike and the front derailleur is the shimano alivio FD MC18. So that would be a top swing front derailleur. Which would be similar to the shimano XT 770, right?
    Yes, SGS is long - designed for a triple chainring / mtb cassette setup.
    GS is medium, and is better suited for a single/dual chainring setup.

    Yes, FD MC18 is top swing, as is the XT 770.

    Sounds like you are on the right track.
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  8. #8
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    Make sure you get an FD with the correct clamp diameter...!

  9. #9
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    Really? In this day and age when everything is made to fit a 35mm OD tube and then you use a shim to make it fit anything smaller
    Quote Originally Posted by kramnnim
    Make sure you get an FD with the correct clamp diameter...!
    One day your life will flash before your eyes, will it be worth watching??
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