Shimano FC-R9100-P Dura-Ace Power Meter 11 Speed Chainset 50/34 Tooth

With several years of development and working closely with professional teams you can expect extreme accuracy from Shimano’s first fully integrated power meter HollowTech II 11-speed Dura-Ace chainset

Accurately calibrated strain gauges are integrated inside both left and 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 and ANT+ with wireless firmware update and data acquisition system

Easily rechargeable integrated battery with fully waterproof reliable electric system

Hollow outer chainring, giving vast improvements in rigidity.

The hollow outer chainring has essentially removed outer chainring flex, hugely improving shift performance making it precise even under high load

These industry leading HollowTech II cold forged hollow crank arms have evolved to increase rigidity and improve strength

The teeth have been developed to work only in conjunction with the 11-speed chains for improved contact providing more efficiency and improved power transfer

There is a wide range of chainring ratios and crank arm lengths available enabling customisation for all riders and racing disciplines

HollowTech II integrated bottom bracket design uses a wider bearing placement and larger axle diameter for increased stiffness and efficiency

Bottom bracket seal design has a minimal bearing interface gives superbly smooth rolling and increased durability