2-speed, DUB, without bottom bracket, 12-speed compatible, hollow carbon crank arms, direct mount aluminum chainring, 45 mm chainline, Bluetooth and ANT+ wireless technology, LED indicator for operational readiness, reset and low battery, Accuracy: +/- 1.5%, dual-sided measurement, tool-free battery change (CR2032) Number of chainrings 2 Type Item Main color black Large chainring 50 T. Small chainring 37 T. Chainline 45.0 mm Crank length 170.00 mm Secondary color gray System compatibility 12-speed Bottom bracket DUB Variation Set SRAM continues to innovate; SRAM's lightest and stiffest crank is now even lighter thanks to an optimized hollow carbon crank. The fully integrated 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 a single piece X-Range technology for more range and smoother operation 29 grams lighter than the previous version Fully integrated power meter Power measurements are accurate within +/- 1.5% and are not affected by weather conditions DUB bottom bracket SRAM Article number: 735225 EAN code: 710845899256 Supplier number: 00.6118.688.003 Retail packaging: Yes