For 10 years now, Quarq has been developing performance measurement systems for athletes who want to leave nothing to chance in training. In the DZero Powermeter platform, the Americans let their entire experience flow in and integrated the latest technical standards.
The DZero Powermeters continue to rely on a spider-based power measurement. Since this system measures the power where it is delivered and the performance of both legs is measured, this system ensures a very high measurement accuracy.Externally modified only in detail, the DZero Powermeter have a completely revised inner life. Not only the measurement technology is new, the arrangement of the strain gauges has also been optimized. The result is an even more accurate power measurement in each phase of a crank rotation and an improved measurement accuracy with temperature fluctuations. Thus, the values ??need to be corrected less by the internal software.Another important new feature is the data transmission via Bluetooth Low Energy Standard, in addition to the transmission in the ANT + standard. Thus, the DZero Powermeter can be paired with almost all available on the market wheel computers and smartphone apps. To upload firmware updates and perform system diagnostics, Quarq has developed the Qalvin app for IOS and Android.
The Quarq DFour Powermeter Spider is designed to fit Shimano Dura Ace 9000 chainrings. Thus, the DFour Powermeter fits perfectly into racing bikes with the Dura Ace 9000 group. The Spider is suitable for Sram Powermeter cranks with 8-screw spider mount .
- 10K Active Temperature Compensation - wireless data transfer via Bluetooth Low Energy or ANT + - Chain shifts require no recalibration has no influence on the measuring accuracy - Cadence measurement via acceleration sensors (no additional magnet required!) - waterproof construction according to IPX7 standard - LED-Power indicator always informs about battery status - 200 hours operating time (toolless battery change according to CR2032 standard) - Power Balance - +/- 1.5% measuring accuracy
Material spider: aluminum bolt circle diameter : 110 mm asymmetrical Compatibility Crank: Sram Powermeter cranks with 8-screw spider mount Compatibility Chainrings: Shimano 11-speed (except R9100), designed for Dura Ace 9000 Technology: Quarq Power Meter Chainrings: without Color: Black
Weight (without inner bearing and chainrings, manufacturer's specification): 154g
Scope of delivery: 1x Quarq Powermeter DFour Spider, without crank arms, without chainrings, without inner bearing.