1-speed, DUB, without bottom bracket 12-/13-speed compatible, hollow carbon crank arms, X-Sync aluminium 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 to IPX7 standard, tool-free battery replacement (CR2032), chainline 47.5 mm Number of chainrings 1 Type Item main colour black Large chainring 40 T. Chainline 47.5 mm Crank length 172.50 mm Secondary colour grey System compatibility 12-speed, 13-speed Bottom bracket DUB Variation Crankset