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  1. #1
    Fat boy Mod Moderator
    Reputation: donalson's Avatar
    Join Date
    Apr 2004

    Karate monkey BB height?

    so I had a KM and never bothered measuring the BB height... its gone now...

    of those out there that have one what kind of BB height do you have (hopefuly in metric with normalish sized 2.1-2.3ish tires on the stock rigid fork.

    just wanting to get an idea to compare to my new ride
    - Surly Disc trucker
    - '82 trek 560 roadie

  2. #2
    mtbr member
    Join Date
    May 2009
    Theoretically you should be able to calculate it from the BB drop. Using the values on the KM's info page for a typical 29x2.3", that's:

    (Wheel diameter/2) - BB drop = (737/2) - 68 = 300.5 mm = 11.8"

    To get true ground clearance (from the ground to the bottom of the BB shell):

    (Wheel diameter/2) - BB drop - (BB shell diameter/2)
    (737/2) - 68 - 17.4 = 283.1 mm = 11.1"

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