Bicycle Bottom Bracket Parts from Harris Cyclery - 28 tpi bottom bracket
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New 28 tpi Bottom Bracket This is a new in the package bottom bracket. This BB is designed to be used with old school 1-piece cranks that have a 28 tpi and. I was wondering if any body knows or could find out the information on the various 28 tpi sealed bottom bracket races out there? The three I am.