Quarq Dfour91 Powermeter Spider Assembly 8-bolt  

Product ID: 75538

Every innovation in Quarq’s next-generation DZero platform is channeled into DFour: 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 new Qalvin BLE app. The DFour chassis pairs with Shimano’s 11-speed Dura-Ace 9000, Ultegra 6800 and 105 5800 chainrings. New DFour91 is designed for Shimano’s Dura-Ace R9100 chainrings. Both use Quarq’s lightweight, sturdy ExogramTM carbon crank arms. GXP and BB30 versions work with every bottom bracket shell, including BBright and BB386EVO. If you already have a power meter with an 8-bolt interface, upgrade using the DFour or DFour91 power meter spider.

THINGS TO REMEMBER
DFour is designed for Dura-Ace 9000 chainrings and compatible with Ultegra 6800 and 105 5800 chainrings.
DFour91 is designed for Dura-Ace R9100 chainrings.
Must be paired with a compatible SRAM bottom bracket.
8-bolt power meter owners can upgrade using a power meter spider.

FEATURES AND 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
2-year warranty
IPX7 waterproof rating
Accuracy -- within 1.5%, measuring both legs.