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Academy Pro Crank SpindleThe Academy Pro Crank Spindle is a genuine replacement spindle for Academy Pro cranks. However, it will fit other BMX cranks that use a 19mm, 48 spline spindle Features: Material: CrMo Size: 19mm, 48 spline Length: 135mmBuy Academy Components from Chain Reaction Cycles, the World’s Largest Online Bike Store.