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PraxisWorks MTB Bottom Bracket Converter This Conversion BB is for installing a Praxis M24 or SRAM GXP steel spindle crank in either BB30 or PF30 MTB frame This bottom bracket is made of lightweight and durable aluminum with long lasting sealed cartridge bearings Forged & machined heat-treated 7075 T6 Aluminum New updated design with Rubber expanding collet