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  • Product description

    Every innovation in Quarq’s next-generation DZero platform is channeled into DFour. It embodies 10 years of Quarq technology advances with new features such as dual Bluetooth low energy and ANT+ wireless data transfer, the new Qalvin BLE app and compatibility with BB386EVO bottom brackets.
    • Designed for Dura-Ace 9000 chainrings. Compatible with Ultegra 6800 and 105 5800 chainrings.
    • Must be paired with a compatible SRAM bottom bracket.
    • ELSA RS power meter owners can upgrade using the DFour Power Meter Spider.
    • Free firmware upgrades with the Qalvin app.
    • BB30 versions ship with the spacers and wave washer required for BB386EVO installation.

    Key Features:
    • Bluetooth low energy technology and ANT+ wireless data transfer.
    • AxCad - no magnet.
    • 10K Temperature Compensation.
    • Battery - CR2032, 200-hour battery life, change without tools.
    • OmniCal - swap chainrings without affecting accuracy.
    • 2-year warranty.
    • IPX7 waterproof rating.
    • Accuracy - within 1.5%, measuring both legs.

    Specifications:
    • Material - CNC Machined Aluminum Spider, Exogram™ Carbon Crank Arms
    • Accuracy - 1.5%
    • Bolt Circle Diameter - 110 Asymmetric BCD
    • Arm Lengths - 162.5mm, 165mm, 170mm, 172.5mm, 175mm, 177.5mm
    • Q-Factor - 145mm
    • Bottom Bracket - GXP, Press Fit GXP, BB30, Press Fit 30, BBright, BB386EVO, BB30A, PF30A
    • Wireless Technology - ANT+, Bluetooth low energy technology
    • Battery - CR2032, 200 hours of riding time
    • Weight - 588g
    • Head Unit - ANT+™ and Bluetooth® low energy technology compatible head units (available separately)
    • Analysis Software - TrainingPeaks WKO4®, TrainingPeaks®, Today's Plan, Golden Cheetah, Strava® and others (available separately)
    • Compatibility - Shimano® 11-speed chainrings (except for R9100). Designed for Dura-Ace® 9000. Compatible with Ultegra® 6800 and 105® 5800.

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