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SHIMANO Threaded Bottom Bracket 68/73 mm shell width · FEATURES · PRODUCT SPECIFICATIONS · TECHNOLOGIES · Manuals & Technical Documents. View online or download PDF (235 KB) Shimano SM-BB52, FC-M6100 User manual • SM-BB52, FC-M6100 PDF manual download and more Shimano online manuals. SHIMANO Threaded Bottom Bracket 68/73 mm shell width · FEATURES · PRODUCT SPECIFICATIONS · TECHNOLOGIES · Manuals & Technical Documents. Bottom bracket. SM-BB52. SM-BB93. SM-BB94-41A. SM-BB72. SM-BBR60 i This dealer's manual is intended primarily for use by professional bicycle mechanics.