Quarq DFour Crank star power meter

Quarq Crank star power meter "DFour"

Quarq crank star power meter "DFour" Without chainrings, 4-arm, black, 11-speed compatible Only suitable for sprocket sets with 8-screw fastening, for Shimano Dura Ace 9100, Bluetooth and ANT + radio technology, IPX7 water protection, accuracy: + / - 1, 5%, double-sided measurement, MagicZero for automatic calibration, tool-free battery replacement (CR2032)