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 generation 8-bolt interface compatible with power and non-power AXS spiders and integrated chainrings (Chainrings sold separately) Rings Sold Separately Number of Chainrings No Rings Included Drivetrain Speeds 12 Chainring BCD Direct Mount SRAM Color Natural Carbon Crank Length (mm) 160 Crank Intended Use Road Crank Intended Use Tri Crank Intended Use Cyclocross BB Included No Pedal Spindle 9/16" Spindle Interface Type SRAM DUB Defined Color Carbon