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 Highroad and Team Sky rely on the SRM PowerMeter DuraAce 7900 compatible - in training and competition.
Crank: Shimano DA-7800
Cranks are available in lengths of between 165 - 180 mm
Chain Rings: Shimano DuraAce 7900
Bolt Circle Diameters: 130 mm
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 PowerMeter, 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.
This product is currently in stock for next day delivery.
|
