Shimano Dura Ace FC-R9100-P Power Meter Chainset - 170mm - 50/34

Product Description

With several years of development & working closely with professional teams you can expect extreme accuracy from Shimano's first fully integrated power meter Hollow Tech II 11-speed Dura-Ace chainset.

Features: Accurately calibrated strain gauges are integrated inside both left & right crank arms, this provides a stable measurement system through rotation from both sides for extremely precise data 2% accuracy of strain gauge measured power Bluetooth & ANT with wireless firmware update & data acquisition system Easily rechargeable integrated battery with fully waterproof reliable electric system Hollow outer chainring, giving vast improvements in rigidity & increased weight savings The hollow outer chainring has essentially removed outer chainring flex, hugely improving shift performance making it precise even under high load These industry leading Hollow Tech II cold forged hollow crank arms have evolved to increase rigidity, reduce weight, & improve strength The teeth have been developed to work only in conjunction with the 11-speed chains for enhanced contact providing more efficiency & enhanced power transfer There is a wide range of chainring ratios & crank arm lengths available enabling customisation for all riders & racing disciplines Hollow Tech II integrated bottom bracket design uses a wider bearing placement & larger axle diameter for increased stiffness & efficiency Bottom bracket seal design has a minimal bearing interface gives superbly smooth rolling & increased durability