Featuring beefy hollow-forged crank arms and a massive 30-millimeter Praxis M-30 spindle cold-forged from 7075 aluminum and precision ground to extremely tight tolerances the Box One M30-M Crankset is the absolute stiffest junior BMX crankset available today. A precision CNC-machined chromoly/alloy self-extracting crank bolt system makes installation and removal a snap. Includes Praxis External BSA Bottom Bracket and M30 installation tool

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