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 Vector 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 150mm Euro BLK 104mm 4-bolt 509g 1UPC/EAN/GTIN: 639266092308