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  1. #1
    mtbr member
    Join Date
    Apr 2007

    HDR 650b 150mm BB height?

    I know the HDR BB height was lowered to compensate for the larger wheels. Does anyone have an idea what the BB would be if the 160 shock were shimmed to 145 (as seen elsewhere) with a 160 fork? Curious as to how that would effect the geometry and overall handling.

  2. #2
    mtbr member
    Reputation: doismellbacon's Avatar
    Join Date
    Sep 2007
    The shock shimming alone will make zero difference to bb height. If you shimmed the shock and left 26" wheels on you'd have the exact same bike only with 15mm less travel in the rear and lots of extra bottom out seat tube clearance. So the bb height will increase by the difference in tire radius, which is exactly 1/2" or 12.5mm ( (584-559)/2 ) given an identical tire profile.

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