The Specialized Power Cranks – Shimano Ultegra Upgrade Kit converts your Shimano Ultegra FC-R8000 left crank into a fully featured power meter, delivering reliable single-sided power measurement and seamless integration with most cycling computers and apps.

• ±1.5 % accuracy tested on the WinMill and validated by the Locomotion Lab

• Dual ANT+ and Bluetooth® connectivity for pairing with head units and smartphones

• Easy setup, calibration, and diagnostics via the Specialized Power app (iOS & Android) 

• Shimano 8000-series Ultegra left-side crankarm with the power sensor integrated into the spindle 

• Right crankarm and chainring not included—use your existing components

• Available in 170 mm, 172.5 mm, and 175 mm crankarm lengths

• Waterproof enclosures and temperature compensation firmware minimize drift in varied conditions