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  1. #1
    ass hatchet slopvehicle's Avatar
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    correct bottom bracket sizing

    What's the correct bottom bracket width for this setup?

    - Miyata 914 road frame ('91 or so)

    - Sugino VP double crankset

    I think the current BB may be too wide-- installed a new wheelset last night and the chainline seems way off.

    Thanks!

    Oh-- I should add that this is essentially a frame-up build, but I figured I could get away with using the previously installed BB. I'll be pulling it tonight to see what size the currently installed bb is.

  2. #2
    Your mom
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    I'm assuming the shell width is 68mm; to get the right spindle length, look up your crankset on Sheldon's site.

  3. #3
    I drink your MILKSHAKE Raiyn's Avatar
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    The crankset determines the BB spindle length.

  4. #4
    Gone, but not forgotten Sheldon Brown's Avatar
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    Quote Originally Posted by slopvehicle
    What's the correct bottom bracket width for this setup?

    - Miyata 914 road frame ('91 or so)

    - Sugino VP double crankset

    I think the current BB may be too wide-- installed a new wheelset last night and the chainline seems way off.

    Thanks!

    Oh-- I should add that this is essentially a frame-up build, but I figured I could get away with using the previously installed BB. I'll be pulling it tonight to see what size the currently installed bb is.
    The frame will definitely use a normal 68 mm English/ISO thread BB.

    Measure the chainline as illustrated at http://sheldonbrown.com/chainline on the present BB. Normally, a double should have a 43.5 mm chainline.

    If it's off, you can easily calculate how much longer or shorter the next BB needs to be once you have taken appropriate measurements.

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