5-arm, without chainrings, black 10-/11-speed compatible, only suitable for DUB cranksets with 8-bolt mounting, suitable for chainrings: SRAM 10-/11-speed, Shimano 10-speed, Rotor, FSA, Praxis, Wickwerks and others, Bluetooth and ANT+ wireless technology, IPX7 waterproof, accuracy: +/- 1.5%, dual-sided measurement, MagicZero for automatic calibration, tool-free battery replacement (CR2032) Number of chainrings none Accessory type main color black System compatibility 10-speed, 11-speed Sram article number: 721177 EAN-code: 710845839436