SRAM Crank | Quarq Power Meter DFour91 BB30 | BB386 | for Dura Ace R9100 Chain Rings
SRAM crank | Quarq Power Meter DFour91 BB30 | BB386 | for Dura Ace R9100 chainrings
For 10 years, Quarq has been developing performance measurement systems for athletes who do not want to leave anything to chance in training. In the DZero Powermeter platform, the Americans incorporated their entire experience and integrated the latest technical standards.
The DZero power meters continue to rely on a spider-based power measurement. Since this system measures the power where it is provided and the power of both legs is measured, this system ensures very high measurement accuracy.Outwardly only changed in detail, however, the DZero power meters have a completely reworked interior. Not only is the measurement technology new, but the arrangement of the strain gages has also been further optimized. The result is an even more accurate power measurement in each phase of a crank revolution and improved measurement accuracy with temperature fluctuations. Thus, the values ??need to be corrected less via the internal software.Another important new feature is the data transmission via Bluetooth Low Energy Standard, in addition to transmission in the ANT + standard. Thus, the DZero power meters can be coupled with almost all available on the market bike computers and smartphone apps. To upload firmware updates and perform health checks, Quarq has developed the Qalvin app for iOS and Android.
The Quarq DFour Powermeter is designed to fit Shimano Dura Ace R9100 chainrings. Thus, the DFour Powermeter blends optically into racing bikes with the Dura Ace R9100 Group. The Carbon Exogram cranks are completely manufactured in hollow construction and thus guarantee very high stiffness values ??at extremely low weight.Thanks to the compact design of the Power Meter, the system weight is very low and offers plenty of space on oversized frames.
- 10K Active Temperature Compensation - Wireless data transmission via Bluetooth Low Energy or ANT + - Chainring changes do not require recalibration and have 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 level - 200 hours of operation (tool-less battery change according to CR2032 standard) - Power balance - +/- 1.5% measurement accuracy
Material crank: carbon Material Spider: aluminum Wave: BB30 | BB386 bolt circle diameter : 110 mm asymmetric Compatibility Chainrings: Shimano 11-speed (except R9100), designed for Dura Ace 9000 Technology: Exogram, Quarq Power Meter Crank arm length: 170; 172.5 or 175 mm Q-factor: 145 mm Chainrings: without Color: black-carbon Finish: UD glossy
Weight (GXP version without bottom bracket and chainrings, manufacturer information): 594g
Scope of supply: 1x SRAM carbon crank with Quarq DFour91 Power Meter, without chainrings, without bottom bracket.