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  1. #1
    mtbr member
    Join Date
    Sep 2004

    Differences between 8 speed xt groups? x-post VRC

    So I am getting parts together for my recently aquired xs buck shaver and it occurs to me that I don't know much about the various flavors of xt components. This is probably due to the fact that I went to XTR as soon as it was available. The last xt group I was familiar with was m735 which if my memory serves me was seven speed and thumbies.

    Given the rapidly rising prices of vintage XTR and the fact that this bike is for my daughter I think the budget will be more towards 8 speed XT on this build. So my question is this. What are the technical and functional differences between the m737, m738 and m739 groups?

    I am mostly concerned with the derailleurs, cassettes, cranks, and other drivetrain bits. I already have hubs. I would like compact drive and a mid cage rear derailleur if possible to keep the weight down. I may also upsell myself to an xtr cassette as I really think they are far better than anything beneath them. The bike will probably be gripshifted because that is what she is used to.

    Thanks In Advance

    I would also consider a sram setup if it was 8 speed and gripshift and compact drive, but honestly i know basically nothing about sram deraillleurs.


  2. #2
    mtbr member
    Join Date
    Mar 2004
    Just curious why you would start with 8 speed instead of 9?

  3. #3
    mtbr member
    Reputation: oldskoolbiker's Avatar
    Join Date
    Jun 2005
    Quote Originally Posted by tron
    Just curious why you would start with 8 speed instead of 9?
    He obviously wants vintage parts, x-post in Vintage forum.

  4. #4
    mtbr member
    Join Date
    Sep 2004
    Because in my not so humble opinion 9 speed sucks. Plus the later versions of xt are hideously ugly.

  5. #5
    I Love my Rize
    Reputation: danoalb's Avatar
    Join Date
    Dec 2005

    Go with Sram

    I run a X9 rear derailleur with 8 speed X9 gripshifters and they are the best shifting you will ever have. X7 is almost as good.
    Early to bed early to RIZE makes a man healthy, wealthy <(scratch that) and wize.


  6. #6
    Mantis, Paramount, Campy
    Reputation: Shayne's Avatar
    Join Date
    Jan 2004

    Cranks Are The Only Real Difference

    737 uses a traditional 5 arm setup with compact rings.
    739 has an integrated big ring/spider that attaches to the drive side arm via lockring ala M95x XTR

    Stay away from the 739 crank unless you buy an aftermarkes spider for it.

    737 uses canti brakes and levers and 739 uses v-brakes and levers.

    Derailleurs, cassettes, and shift pods are the same for all intents and purposes.
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