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.

Chain Rings: Shimano DuraAce 7900

Bolt Circle Diameters: 130 mm or 110 mm

(Includes 39/53 chainrings or 50/34 chainrings)

Weight: 910g with PowerMeter, crank, chain rings and bottom bracket

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: 147.5 mm

Allow up to 3 business days for shipment.
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