SRAM has taken aluminum to another level. Careful engineering has resulted in crankarms that optimize stiffness to weight ratio, with material only where it's needed8-bolt interface compatible with power and non-power AXS spiders and integrated chainrings (Chainring and spider sold separately)DUB bottom bracket adds durability and simplicity (Bottom bracket sold separately)Aluminum arms optimized for stiffness and light weightItem SpecificationsBB IncludedNoChainline/Hub Compatibility135/142 Road Disc Hubs < 415 mm ChainstayChainline/Hub Compatibility135/142 Road Disc Hubs > 415 mm ChainstayChainring BCDDirect Mount SRAM 8-BoltColorBlackCrank Intended UseRoadCrank Length (mm)160Defined ColorBlackDrivetrain Speeds12Drivetrain Speeds13Number of ChainringsNo Rings, No Spider IncludedPedal Spindle9/16"Spindle Interface TypeSRAM DUB SRAM Rival Crank Arm Assembly E1 Crankset UPC: 710845916410