This spider provides the newest electronics on some older Quarq power meter cranksets. If you have a compatible Quarq 8-bolt crankset now, and if you want to run a Quarq powermeter with the 2nd generation Shimano 11-speed double drivetrain, the DFour91 Power Meter Spider was designed just for you. You make no sacrifices in shifting quality or performance and get one of the most accurate power meters available. See the list below for compatible SRAM/Quarq cranksets.

The success of Quarq's DFour91 Power Meter, which is built for compatibility with Shimano Dura-Ace R9100 and Ultegra R8000 11-speed chainrings, has led the SRAM family power meter company to offer the actual power meter spider system so that owners of Quarq 8-bolt spider driveside cranksets can update to the DFour91.

With the DFour91 system, SRAM Quarq surpassed the excellence of the Quarq Elsa RS. The Bluetooth low energy (BLE) technology and ANT+ wireless data transfer choices delivers more options and simple smartphone direct set-up. The new Qalvin BLE app powers wireless firmware updates, diagnostics, power meter zeroing and calibration, and is equally useful for home or bike shop service, and riders of any level. You can even change the power meter’s slope using the built-in calibration routines. It is great to have such a simple and useful interface for these processes.

The powermeter itself is housed in a CNC machined aluminum spider. Your Shimano R9100 or R8000 chainrings will bolt right on the spider via the Shimano hardware. The OmniCal calibration system ensures that you can install and change rings without impacting the power meter's overall calibration. The alignment of the design keeps the Quarq battery compartment completely accessible on the front of the crankset, just above the arm. ANT+ or BLE transmission is verified by LED for simple, clear operation, and Quarq makes the ANT+ ID visible to ensure proper connection.

Quarq has installed their AxCad™ accelerometer, which eliminates the need for a cadence magnet. Given the shape and size of the spider, many frames formerly had difficulty accommodating the unit and the magnet. Now the set-up is cleaner and you have more frame clearance. AxCad is a highly reliable measure of cadence while pedaling, and reacts quickly to changes and stoppage. Many power meter manufacturers have struggled to address temperature variation, but the engineers developed new sensors and firmware, called 10K™ temperature compensation, that eliminates temperature effects on power measurement through more frequent, more accurate temperature readings throughout the pedal stroke. Quarq considers the DZero to be accurate in all conditions to within +/- 1.5%, placing it among the most accurate power meters on the market.

ANT+ wireless transmission gives you maximum flexibility in your choice of head units from Garmin, PowerTap, Lezyne, and so on. Or you can choose BLE capable head units or smartphones. Syncing your DZero is simple, as is your pre-ride zeroing. All of the usual power measurement metrics are measured and calculated for your head unit and can be downloaded or transferred to your favorite training and analysis programs, such as Training Peaks, Strava, and Golden Cheetah. The widely available CR2032 battery generally delivers 300 hours of transmission before replacement is necessary, so you won't have to worry about losing data. Quarq power meters have an IPX7 waterproof rating, so you ride in the rain all you want. They feature a 2-year warranty, free firmware updates, and strong Quarq-direct support.

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