BSA External Bottom Bracket - Shimano RoadDescription BSA Bottom Bracket Includes replacement dust covers and seals CNC machined aluminum shell for precise bearing alignment and frame fit ABEC 3 sealed bearings Grade 10 chromium steel balls, 52100 High Carbon Chromium Alloy Races Replaceable Enduro bearings Made in the USA External English (BSA) threaded road bottom bracket for 68mm shells
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