50 teeth, 1x, DUB, bottom bracket not included, 12-speed compatible, hollow carbon crank arms, X-Sync Aero direct mount aluminum chainring, Bluetooth and ANT+ wireless technology, LED indicator for readiness, reset and low battery, Accuracy: +/- 1.5%, dual-sided measurement, tool-free battery replacement (CR2032), chainline 45 mm Number of chainrings 1 Type Item Main color black Large chainring 50 T. Chainline 45.0 mm Crank length 175.00 mm Secondary color grey System compatibility 12-speed Bottom bracket DUB Variation Crankset The new and refined construction of the 1x RED Aero crankset has resulted in a very low weight and high stiffness. It is no less than 29 grams lighter than its predecessor. The highly accurate integrated power meter has also become lighter with a new carbon crank arm construction. This is very accurate to +/- 1.5% deviation and is not affected by temperature fluctuations.Single chainring drivetrain simplifies functionality and reduces weightPower meter is fully integrated into the chainring for lower weight and greater accuracyHighly accurate power measurement to +/- 1.5% deviationDirect mount aero chainringsOptimal chain control through X-range chainringUltralight hollow carbon cranksDUB bottom bracketSram Article number: 735224 EAN code: 710845899096 Supplier number: 00.6118.686.005 Retail packaging: Yes