Quarq's power meter cranks continue to be reliable, accurate and easy to use. The Dfour91 model accepts Shimano Dura Ace 9100 and Ultegra R8000 road chainrings and offers more data transfer and frame fit compatibility.
- DFour91 is compatible only with Dura Ace 9100 and Ultegra R8000 chainrings
- Measures power for both legs with +/_ 1.5% accuracy
- Dual Bluetooth lowenergy and ANT+ wireless data transfer
- AxCad system provides no-magnet cadence data
- Free firmware updates with the QALVIN APP
- Uses a CR2032 battery that can be replaced without tools
- Swap chainrings without needing to recalibrate