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New Power Meter furthers Shimano's system integration
The FC-R9100-P delivers world-class power measurement seamlessly designed into the new DURA-ACE HOLLOWTECH II crankset. The dual-sided strain gauges are internally hard wired together for reliable performance in all weather conditions and accurate measurement regardless of pedaling position. Shimano’s integrated approach also ensures simplified maintenance with a single rechargeable battery powering the entire unit and the ability to wirelessly update firmware.
Integrated design delivers system reliability and waterproof performance in all conditions
Dual-side strain gauges are hard wired together for accurate data collection and direct response
±2% strain gauge power measurement accuracy
Stable power measurement system across all pedaling positions
Reliable electrical system that is waterproof in all conditions
Single rechargeable battery for easy maintenance
Easily swap chainrings without affecting power measurement
Bluetooth and ANT+ wireless communication
Crank arm lengths:
170, 172.5, 175mm (w/chainrings)
165, 167.5, 170, 172.5, 175, 177.5, 180mm (w/o chainrings)
Rider Tuned gear combinations (2x11): 50-34T, 52-36T, 53-39T
zdroj:
http://bike.shimano.com/content/sac-bike/en/home/news-and-info/news/shimano-introduces-new-dura-ace-r9100-road-components--integrate.html