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Upgrade a Quarq 8-bolt power meter (see below) or Quarq Prime Power Ready crankset with a DFour91 power meter to make the most of your Shimano® Dura-Ace® R9100 groupset, which embodies all the advances of the next-generation DZero platform.
Designed especially for Shimano®’s Dura-Ace® R9100 series chain rings, the Quarq DFour91 Power Meter brings Quarq’s next-generation DZero platform to Shimano’s latest groupset. Compatible with Ultegra® R8000 chainrings.
DFour91 embodies 10 years of Quarq advances in power meter technology, plus new features such as dual Bluetooth Low Energy and ANT+ wireless data transfer, revised circuitry, a new strain gauge design and the Qalvin BLE app.
The DFour91 power meter is a bolt-on upgrade, pairing with the 11-speed Dura-Ace R9100 or Ultegra® R8000 chainrings. If you already have a power meter using the 8-bolt interface, upgrade with the DFour91 spider.
Features & Benefits
Bluetooth low energy technology and ANT+ wireless data transfer.
AxCad – no cadence magnet required.
10K Temperature Compensation.
Battery – CR2032, 200-hour battery life, change without tools.
OmniCal – swap chainrings without affecting accuracy.
IPX7 waterproof rating.
Accuracy – within 1.5%, measuring both legs.
Free firmware upgrades with the Qalvin app.
Designed for Dura-Ace® R9100 chainrings. Compatible with Ultegra® R8000 chainrings.
Only 8-bolt power meter owners can upgrade using the DFour91 Power Meter Spider.