Bottom bracket marked FI?

dzrm
dzrm Posts: 7
edited October 2016 in MTB workshop & tech
Hi. I need to replace my bottom bracket on a 2008 (probably) Specialised stumpjumper. It's a hollowtech marked "Mountain FI (F1?) Do not disassemble".

I can't find anything with the same markings anywhere. Anyone know what I can replace it with?

Cheers

Comments

  • JBA
    JBA Posts: 2,852
    I think it's a standard Shimano Hollowtech II BB.
    Can you put a photo up to help with identification?
    “Life has been unfaithful
    And it all promised so so much”

    Giant Trance 2 27.5 2016 ¦ Sonder Broken Road 2021¦ Giant Revolt Advanced 2 2019 ¦ Giant Toughtroad SLR 1 2019 ¦ Giant Anthem 3 2015 ¦ Specialized Myka Comp FSR 2009
  • dzrm
    dzrm Posts: 7
    Cheers for your reply!

    I've no easy access to a camera at the moment. But someone at Chainreaction got back to me to say it's a M770/SLX M660, or at least, that's a compatible replacement. How much do they differ in reality?
  • The Rookie
    The Rookie Posts: 27,812
    All HT2 (Hollowtech is for crank arms and not BB's) BB's are interchangeable, the higher end are lighter and/or have better bearings (well better protected). SLX and XT are basically the same while Saint and XTR likewise (except later XTR with the smaller sizing).
    Currently riding a Whyte T130C, X0 drivetrain, Magura Trail brakes converted to mixed wheel size (homebuilt wheels) with 140mm Fox 34 Rhythm and RP23 suspension. 12.2Kg.

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