1-speed, DUB, without bottom bracket, 12-/13-speed compatible, hollow carbon crank arms, X-Sync aluminum chainring for screw mounting, Bluetooth and ANT+ wireless technology, LED indicator for operational readiness, reset, and low battery level, accuracy: +/- 1.5%, dual-sided measurement, waterproof according to IPX7 standard, tool-free battery replacement (CR2032), chainline 47.5 mm Number of chainrings 1 Type article Main color black Large chainring 42 T. Chainline 47.5 mm Crank length 167.50 mm Secondary color grey System compatibility 12-speed, 13-speed Bottom bracket DUB Variation crankset