As part of the SRAM family, Quarq's reputation for quality, light weight and cutting edge data collection has been well earned, and direct product alignment for their DZero power meter crank with the Red drivetrain is a no brainer. Bluetooth low energy (BLE) technology and ANT+ wireless data transfer choices delivers more options and simple smartphone direct set-up. The Qalvin BLE app delivers 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 that is mated to a lightweight Hollow Carbon crank arm with one of several spindle/bottom bracket set-ups (ex. GXP, BB30, BB386EVO, etc). The combination was developed for complete integration. The stiffness and power transfer of the crankset is excellent, and there is zero power loss from the spider design. SRAM's Red and other (made to SRAM spec) 5- bolt 11-speed (not included) will bolt right on the spider via the same hardware. Please note that this DZero is offered for both Hidden Bolt (HB),and non-Hidden Bolt (NHB) options, so choose your rings properly. but regardless of what rings you need, the OmniCal calibration system ensures that you can install and change rings without impacting the power meter's overall calibration. The alignment of the five arm 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.... Read More