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Conversion BB Shimano Mountain Medium (54 56) one piece block of 7000 series aluminum 86 24053 one piece block of 7000 series aluminum Designed to mount on most bicycles with 16 to 20" wheel sizes This Conversion BB is for installing a Shimano Hollowtech II steel spindle crank in either BB30 or PF30 mountain bike frame This bottom bracket is made of lightweight and durable aluminum with long lasting sealed cartridge bearings
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