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 7950 compact chainrings which are significantly stiffer. If you ride Shimano DuraAce 7950 conventional or Di2 - you benefit from increased power transmission.

Team HTC Highroad, Team Leopard and Team Sky rely on the SRM PowerMeter DuraAce 7950 compatible - in training and competition, especially for the steep mountain stage (e.g. in the Giro D'Italia).

Eight strain gauges guarantee an accuracy of +/-2%.
Data are processed by the best electronic components and sent wirelessly via ANT+sport protocol to the PowerControl 7 or Garmin ANT+sport devices (like Edge 500, 800 or Forerunner 310 XT).
After training or competition, SRM Win Software is used to read and analyze the data.

Installation of the wireless system is easy, and auto-calibration and auto-zero-offset facilitate everyday use and accuracy.

Each SRM System is custom built in Julich, Germany and Colorado Springs, USA.

Technical Data:

Bottom bracket is not included in the scope of the delivery.