2-speed, DUB, bottom bracket not included, 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 replacement (CR2032) Number of Chainrings 2 Item Type Main Color black Large Chainring 48 T. Small Chainring 35 T. Chainline 45.0 mm Crank Length 165.00 mm Secondary Color grey System Compatibility 12-speed Bottom Bracket DUB Variation Groupset 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 take performance to the next level. Professionals can no longer do without it. It is the lightest, stiffest, and most accurate (max +/-1.5% deviation) power meter ever. Crankset manufactured from one piece X-Range technology for greater range and smoother operation 29 grams lighter than the previous version Fully integrated power meter Power readings are accurate within +/- 1.5% and are not affected by weather conditions DUB bottom bracket SRAM Article Number: 735229 EAN code: 710845899294 Supplier number: 00.6118.688.007 Retail packaging: Yes