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    Quarq DFour91 Spider

    $789.00
    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.
    SKU: 00.3018.191.000
    Availability: Out of stock

    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.
    • 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 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
    2018 Quarq Lineup Overview

    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.
    • 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 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