2-speed, DUB, bottom bracket not included 12-speed compatible, hollow carbon crank arms, direct mount aluminum chainring, chainline 45 mm Number of chainrings 2 Type Article main color black Large chainring 50 T. Small chainring 37 T. Chainline 45.0 mm Crank arm length 170.00 mm Secondary color grey System compatibility 12-speed Bottom bracket DUB Variation Crankset SRAM continues to innovate, SRAM's lightest and stiffest crank is now even lighter thanks to optimized hollow carbon crank arms. The optional power meter is the ultimate tool to elevate performance. Professionals can no longer do without it. It is the lightest, stiffest, and most accurate (max +/-1.5% deviation) power meter ever. Crankset made from one piece X-Range technology for more range and smoother shifting 29 grams lighter than the previous version DUB bottom bracket Optional power meter SRAM Article number: 735206 EAN code: 710845898594 Supplier number: 00.6118.683.003 Retail packaging: Yes