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  • explain the difference please
  • mattp
    Free Member

    i have an '09 spesh epic and it needs new chain rings bb bearing. i've been looking at replacement/upgrades and am a bit stumped by the choices from shimano. please explain the difference and which one i need. ta

    XT M771

    XT M770

    Posted 14 years ago
    piedidiformaggio
    Free Member

    771 – 48/36/26 tooth
    770 – 44/32/22 tooth

    And they look a bit different

    Posted 14 years ago
    rockthreegozy
    Free Member

    M770 = standard for most bikes- ie. 22-32-44 chainrings
    M771 = designed for touring- 26-36-48 chainrings. Theres a spacer on the axle so it sits ever so further out to aid chainstay clearance.

    M771 is good if you plan on running a double+ bash setup, 26/36 is better for that I reckon.

    Sounds like you need M770..

    Posted 14 years ago
    qwerty
    Free Member

    as above plus crank lengths vary, 175mm is "normal", 170mm of your shortish, 180mm if your huge

    PS the 48/36/22 is "touring" gearing

    Posted 14 years ago
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