GT Borrego circa 1994 Bottom Bracket

Hi all,

Bottom bracket needs replacing. Never done anything like that before.

Can anyone point me to a workshop manual? I am in the UK where would anyone suggest I obtain the necessary parts?



  • The Rookie
    The Rookie Posts: 27,812
    Depends what BB you have!
    I'd expect its a sealed square taper so

    Remove cranks

    Change BB

    You need to remove the cranks, measure the frame shell width and the axle width and buy a suitable replacement, go with Shimano EN53 of the correct size, usually cheapest on Ebay.
    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.