For focused workouts that yield results, you can't beat the consistency and accuracy of power-based training. And this unit is as low-profile and lightweight as a power meter gets – 15 grams, with a minimal housing and sleek front profile. You can expect wattage readings to be accurate within 1.5%. ANT+ and Bluetooth Smart compatibility make it good to go with pretty much any major GPS or cycling computer on the planet. Using a compact, easy-to-source coin cell battery, its battery life is over 200+ hours, and you can swap it out quickly without tools.

• Comes pre-mounted to Shimano's Ultegra R8000 non-drive crank arm. Be sure to select the correct length.
• Compatible with all Shimano Hollowtech II road drivetrains.
• Same low-profile case as the previous version, with upgraded electronics for improved signal strength.
• LED indicator displays battery level at start up and confirms calibration.
• Fully sealed unit with IPX 7 waterproofing.
• Power is measured in kilograms via strain gages and mathematically converted to Watts.
• Active temperature compensation allows accurate readings regardless of weather.
• Accelerometer-based cadence readings keep your bike free of wires, magnets, zip-ties and other hardware.
• Specifications: accuracy: ± 1.5%, power range (Watts): 0 to 5000, cadence range (rpm): 10-220.
• Wireless firmware upgrades keep the unit future-proof.
• ANT+ and Bluetooth Smart compatibility.
• Software compatibility: Stages Link, Training Peaks, Strava, Garmin Training Center and others.
• CR2032 battery lasts 200+ hours and is user-replaceable without tools.
• Fits most bike frames; check Stages fit guide for details.