Oversize AL 7075 spindle increase stiffness and reduces weight of crankset. 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.
Crank arm length: 170mm. - Bottom bracket: external BB parts. - BB weight: 116g. In fact we realized that in competition, riders were using triple or double chainrings depends on the field difficulty of the competitions.