Quarq DFour91 Power Meter Spider

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, although aesthetically it will not match as well as the R9100 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 magnet.
• 10K Temperature Compensation.
• Battery – CR2032, 200-hour battery life, change without tools.
• Power Balance.
• OmniCal – swap chainrings without affecting accuracy.
• 2-year warranty.
• IPX7 waterproof rating.
• Accuracy – within 1.5%, measuring both legs.
• Free firmware upgrades with the Qalvin app.

Essential Details

• Designed for Dura-Ace® R9100 chainrings. Compatible with Ultegra® R8000  and 105® R7000 chainrings.
• Only 8-bolt power meter owners can upgrade using the DFour⁹¹ Power Meter Spider.

8-Bolt Compatibility

Power meters and cranksets on 8-bolt since release:

• Quarq ELSA RS (Aug ’14)
• Quarq RIKEN AL (Apr ’15)
• Quarq Prime Power Ready Cranksets (Mar ’16)
• SRAM RED Power Ready Cranksets (Mar ’16)
• SRAM XX1 Power Meter (Aug ’14) (Note: Boost spiders should not be paired with 156Q crank arms)
• SRAM RED BB386EVO standard crankset (Mar ’16)

Power meters switched to 8-bolt:

• Quarq RIKEN R (Revision AEQ onward, except warranty/replacement – Jul ’15)
• SRAM RED (eTap graphics – Jan ‘16)

Incompatible products:

• Quarq ELSA R

ORDER INFORMATION:

If the information you provide results in an incorrect order that must be returned you will be responsible for the $50 restocking fee. If you are unsure about any information required, contact us.