The Stages Power L Ultegra R8100 172.5 mm Power Meter is a Gen 3 single-sided left-leg power meter built onto a non-drive-side Shimano Ultegra R8100 crank arm. It delivers ±1.5 % accuracy, ANT+ and Bluetooth SMART connectivity, and IPX7 water resistance, with over 200 hours of CR2032 battery life. Compatible with all Shimano Hollowtech II road cranksets, it measures left-leg power and doubles it to estimate total output from 0 to 2500 W.

• Crank length: 172.5 mm
• Accuracy: ± 1.5 %
• Power range: 0–2500 W
• Cadence range: 10–220 rpm
• Battery: CR2032 coin cell, 200+ h life
• Connectivity: ANT+ and Bluetooth SMART
• Water resistance: IPX7
• Compatibility: Shimano Hollowtech II road drivetrains