When SRAM found ways to make their lightest and stiffest crank even lighter, they went for it. A new optimized layup drops 29g from the hollow carbon arms. Plus they're offering more crankarm lengths than ever before to ensure this crank works for you.Carbon crank arms are 29g lighter than previous generation8-bolt interface compatible with power and non-power AXS spiders and integrated chainrings (Chainrings sold separately)Item SpecificationsBB IncludedNoChainline/Hub Compatibility135/142 Road Disc Hubs < 415 mm ChainstayChainline/Hub Compatibility135/142 Road Disc Hubs > 415 mm ChainstayChainring BCDDirect Mount SRAM 8-BoltColorNatural CarbonCrank Intended UseCyclocrossCrank Intended UseRoadCrank Intended UseTriCrank Length (mm)155Defined ColorCarbonDrivetrain Speeds12Number of ChainringsNo Rings IncludedPedal Spindle9/16"RingsSold SeparatelySpindle Interface TypeSRAM DUB SRAM RED Crank Assembly E1 Crankset UPC: 710845925238