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  1. #1
    bike nerd
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    Spacers ok on ROAD hollowtech II BB ?

    ok I'll try to ask this question in a different way: Is it ok to put spacers in a road hollowtech II (6600) bottom bracket? Either between frame and cup or cup and crank would be ok; I need to push both crank arms away from the chainstays by about 3mm each. I noticed that spacers are required for mountain HTII BBs, but can't find anything referring to them for road parts. I don't know if the length of the spindle and amount of threads will allow for it. see my previous post: http://bikeforums.net/showthread.php?t=196949

    many thanks

  2. #2
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by jrcal
    ok I'll try to ask this question in a different way: Is it ok to put spacers in a road hollowtech II (6600) bottom bracket? Either between frame and cup or cup and crank would be ok; I need to push both crank arms away from the chainstays by about 3mm each. I noticed that spacers are required for mountain HTII BBs, but can't find anything referring to them for road parts. I don't know if the length of the spindle and amount of threads will allow for it. see my previous post: http://bikeforums.net/showthread.php?t=196949
    Spacers can compensate for different bottom bracket shell widths, but there is no practical way to change the tread (a.k.a. "Q factor") of a Hollowtech II crankset.

    If you were to do what you propose, you would be reducing the spline engagement of the left arm by 6 mm, which would almost certainly result in failure of the connection between the arm and the spindle.

    You might want to consider Kneesavers instead.

    Sheldon "Nope" Brown
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