Screw mount, without chainring, 12-speed compatible, suitable for crank arms with 8-bolt attachment, Bluetooth Low Energy and ANT+ wireless technology, waterproof according to IPX7 standard, accuracy: +/- 1.5%, dual-sided measurement, MagicZero for automatic calibration, tool-free battery replacement (CR2032) Number of chainrings none Accessory type Main color black Bottom bracket DUB Sram article number: 733446 EAN code: 710845886294