Control Tech Rage D 9/10-Speed Crankset

Nowadays, BB30 has become a standard. The first benefit is weight saving by eliminating the BB cups of current outer bearing system. Second, the oversized AL 7075 alloy spindle and oversize bottom bracket greatly increase stiffness. Third, the larger bearings are more durable and make bearing life longer. Fourth, BB30 is narrower than current outer bearing systems. It lowers the Q Factor and gives the rider greater ankle clearance. BB30 system, for MTB bikes.