SRM Wireless PowerMeter DuraAce 7900 Compatible

Shimano's development of the Dura-Ace Di2 electronic shifting system makes gear changes faster and virtually eliminates missed shifts, but the force on the chainrings is much higher than before. Therefore Shimano developed new DuraAce 7900 chainrings which are 20% stiffer. If you ride Shimano DuraAce 7900 conventional or Di2 - you benefit from increased power transmission.

Team HTC Columbia and Team Sky rely on the SRM PowerMeter DuraAce 7900 compatible - in training and competition. Prototypes of the PowerMeter were already tested in the 2009 season, for example during the Tour de France.

Crank: Shimano DA-7800 Arms, Aluminum Spider
Cranks are available in lengths of between 165 - 180mm

Chain Rings: 53/39
Bolt Circle Diameters: 130mm
Standard: 39/53
All other chain ring combinations are available at an extra charge

Bottom Bracket: Shimano FC-7800 (weight: 98 g) or FC-7900 (weight: 90 g) - Not Included

Weight: 910g with crank, chain rings and bottom bracket (90 g)

Strain Gauges: 8

Cadence Range: 30-255 rpm

Wattage Range: 0-4096 Watts

Wireless Protocol: Wireless ANT+ Sport

Accuracy: +/- 2%

Battery Life: 1400 hours of use

Q-Factor: 147.5mm

Compatible wireless with PowerControl 7 and PowerControl VI.