Bicycle Mechanics - schwin high sierra bottom bracket?
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07-11-12, 07:08 PM
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?
07-11-12, 10:44 PM
You should be fine with a modern version.
07-11-12, 10:58 PM
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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