2-speed, DUB, power meter, without bottom bracket, black 12-speed compatible, carbon crank arms, aluminum chainring set for screw mounting, chainline 45 mm, Bluetooth and ANT+ radio technology, LED indicator light for readiness for operation, reset, and low battery level, accuracy: +/- 1.5%, dual-sided measurement, tool-free battery replacement (CR2032) Number of chainrings 2 Article main color black Large chainring 48 T. Small chainring 35 T. Chainline 45.0 mm Crank length 160.00 mm System compatibility 12-speed Bottom bracket DUB Variation crankset