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  1. #1
    Newbie bikemeanics's Avatar
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    schwin high sierra bottom bracket?

    I have a 1985 schwin high sierra that was given to me and I need to replace the bottom bracket. It is a sugino and it only has markings on the spindle, 3U, D-9, SCM. I don't know what they mean and Sheldon browns website doesn't either. I measured a 68x127. I want to know if I can replace it with a modern version that would fit and if the markings have anything to do with it?

  2. #2
    Senior Member mechBgon's Avatar
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    You should be fine with a modern version.

  3. #3
    Bicycle Repair Man !!! Sixty Fiver's Avatar
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    Sugino and Shimano have different crank tapers... older Sugino cranks (ISO) will sit 4.5mm farther outboard on a Shimano spindle (JIS) while a Shimano crank (JIS) on an older Sugino ISO spindle will sit 4.5mm farther inboard.

    If it is a newer Sugino crank that is JIS a 127mm bottom bracket is the needed replacement, if it is an older ISo crankset and you use a Shimano / JIS bottom bracket you need to adjust by using a spindle that is 4.5mm narrower (approximate).

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