For focused training that yields results, the consistency and accuracy of power-based training cannot be beat. And this unit is as low-profile and lightweight as a power meter gets – 20 grams, with a minimal housing and sleek front profile. You can expect wattage readings to be accurate within 2%. 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, the battery life is over 200+ hours, and you can swap it out quickly without tools.

• Comes pre-mounted to Shimano's 105 5700 non-drive crank arm. Is not compatible with Shimano 105 5800 cranks.
• Shimano FC-5700 non-drive crank can pair with both compact and standard ring setups. Be sure to select the correct length.
• Compatible with all Shimano Hollowtech II road drivetrains.
• 2016 model features a 28% lower profile and a 17% reduction in frontal area.
• 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: ± 2%, power range (Watts): 0 to 2500, cadence range (rpm): 20-220.
• Wireless firmware upgrades keep the unit future-proof.
• ANT+ and Bluetooth Smart compatibility.
• Software compatibility: 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.