The Stages Ultegra R8000 G3 Power Meter gives you ultra-reliable readings in any weather conditions with increased accuracy. Stages Power has carried riders to three consecutive Tour de France victories, plus many more world and national championships. If you believe racing provides the world’s best product proving ground, then Stages Power is proven as the world’s best power meter. Consistency of measurement is the most important feature of a power meter. Stages Power was the first meter to make temperature compensation an automatic process ensuring accurate readings no matter the environmental conditions. ATC is the key reason a rider can trust data from Stages Power in all conditions. Stages Power meters are calibrated individually to ensure a +/- 1.5% accuracy level. Individual calibration means that you can trust the bi-lateral data produced by our system, as it's a real measurement and not an estimation. Boasting both Bluetooth and ANT+ transmitters, this chainset's power meter maintains a strong and stable connection with your cycle computer. To top it off, there's also a more advanced accelerometer so the power meter has a faster sampling rate for more up-to-date feedback on your performance. This high-spec component is the ultimate upgrade for taking your training to the next level.  Stages Ultegra R8000 G3 Power Meter Features +/- 1.5 % accuracy in all conditions Active temperature compensation Accelerometer based cadence measurement Wirelessly upgradable firmware LED indicator displays battery level at start up (with no need for connect to an app) and confirms successful zero reset Updated accelorometer and addition of gyroscope for improved cadence resolution Upgraded BLE and ANT+ radios offer a 6x improvement of data transmission strength  Stages Ultegra R8000 G3 Power Meter Specifications Accuracy: ± 1.5% Power meter housing: low profile design, with robust door interface. Tool free battery replacement on the left arm and phillips head screw access on the drive side Weight: Only adds 35g to base crankset Battery Life: 175+ hours (via 2 coin cell: CR2032) Power range (Watts): 0 to 2500 Cadence range (rpm): 20-220 Water resistance rating: IPX7 *This new Shimano Dura-Ace R8000 Stages Power LR power meter is compatible with all Shimano Hollowtech II, 11-speed, road drivetrains.