The world�s first with a Praxis 35-millimeter external bottom bracket system Ridden to a 2013 World Championships by Caroline Buchanan, a silver medal by Marc Willers and bronze by Manon Valentino, the Vector M35 has proven itself as the go-to choice for elite BMX racers Hollow forged crank arms and a massive 35 millimeter Praxis spindle cold-forged from 7075 aluminum make this the absolute stiffest BMX race crank on the market today Precision CNC-machined chromoly/alloy self-extracting crank bolt system rounds out the crankset, making installation and removal a snap 177mm BB/PF30 BLK 104mm 4-bolt 746g 1UPC/EAN/GTIN: 639266089438