Stages Power Right for Shimano Dura-Ace 9100 or Ultegra R8000 is a right side only power meter that will transform new and existing Gen 2 Stages Power meters into a dual-sided power option.Specifications:Accuracy: ± 1.5%,Weight: Only less than 15gr to base crank arm,Battery Life: 200+ hours (coin cell: CR2032),Power range (Watts): 0 - 2500,Cadence range (rpm): 20 - 220,Water resistance rating: IPX7,Frame Compatibility: Most frames, see fit guide in our Support section,Chainring Compatibility: 53 x39, 52x36, 50x34,Device Compatibility: ANT+, Bluetooth Smart Ready,Software Compatibiity: Stages Link, Today\'s Plan, Training Peaks, Strava, Garmin Training Center and others,Tool free battery replacement,Active temperature compensation,Accelerometer based cadence measurement,Wireless firmware upgrades.