Di2 and 10 Speed Shimano Integration.
Complete your dream bike build with the industry standard in precision power measurement.
The SRM Shimano 7900 and 7950 PowerMeters were designed for Shimano 7900 series 10 speed users and more specifically, Di2 Electronic users. Electronic shifting systems make gear changes faster and virtually eliminate missed shifts, but the forces on the chain rings are much higher than with mechanical derailleurs. With this in mind Shimano developed the Dura-Ace 7900 and 7950 chain rings which are 20% stiffer than previous rings. This not only benefits the shift, but also in power transfer from the crank arm through the spider and into the drivetrain. If you ride Shimano DuraAce 7900 mechanical or Di2 electronic, you will benefit from increased power transmission!
Available models 7900: 130 BCD 53/39, 7950: 110 BCD 50/34
Weight: 820 g 7900
Weight: 765 g 7950
BCD: 130 or 110 mm
Q-Factor: 147.5 mm
Wireless: ANT+ Compatible
Battery Life: 1900 hours
Accuracy: < 1.0% error
PowerMeter Spider 130 or 110 mm
Drive and Non-Drive Side Shimano FC-SR70 Crank Arms
Shimano 7900 Series Chain Rings
Shimano Chain Ring Screws
Cadence Magnet Kit