50 teeth, 1-speed, DUB, without bottom bracket, 12-speed compatible, hollow carbon crank arms, X-Sync Aero aluminum chainring for direct mounting, Bluetooth and ANT+ radio technology, LED indicator for operational readiness, reset, and low battery level, accuracy: +/- 1.5%, dual-sided measurement, tool-free battery replacement (CR2032), chain line 45 mm Number of chainrings 1 Type Item main color black Large chainring 50 T. Chain line 45.0 mm Crank length 167.50 mm Secondary color grey System compatibility 12-speed Bottom bracket DUB Variation Groupset