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  1. #1
    mtbr member
    Join Date
    Apr 2005

    BB for FC-M540 Custom Shimano Hollowtech, Octalink XT Spline (X-Ref to Drivetrain..)

    I need to replace the Bottom Bracket on my 2005 Specialized SJ 120.

    The crank is stamped as a FC-M540; however, is listed as Custom Shimano Hollowtech, Octalink XT Spline. From the following thread it looks like I need to use a XT-level BB.

    My current (stock) BB is a Simano ES-30 Octalink spline, 68 mm shell, 118 mm spindle. 50 mm chainline.

    What are my options?

    I'm thinking of buying the following Shimano BB-ES71 (XT):

    Are they the same (I presume so) and would that work?

    Anything else that I need to consider? I've never done a BB job before, but I think that I have all the right tools (crank puller, BB cartridge tool, calipers) to do so. Do I need special grease or can I just use anti-seize?

    Thanks in advance!

    -- 2009 Norco Faze 2 --
    -- 2007 Cannondale Synapse Alloy 2 --
    -- 2011 All-City Nature Boy --

  2. #2
    mtbr member
    Reputation: gticlay's Avatar
    Join Date
    Dec 2007
    You might be able to get the direct replacement from Specialized?? A new Shimano BB will come with this white anti-seize alreay on it. I always put some grease too but not sure if that's a good idea or not.

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