PowerTap G3 Alloy Clincher Shimano Wheelset. Accurately measure your output with the lightest power meter hub on the market courtesy of Powertap. The Powertap G3 Alloy Clincher Wheelset measures your wattage so you can measure and gauge your consistency, max thresholds, and avoid overtraining forever. The new G3 features an ANT wireless transmitter to send power, torque, speed, and virtual cadence data to any computer unit that translates ANT. The G3 is capable of storing up to 15 hours of data in one second gathering intervals, and up to 30 hours of data in two second gathering intervals. The G3 design also features the new 'torque tube' with eight strain gauges, yielding measurements accurate within 1.5% between 40 and 130 rpm. Not compatible with Powertap Branded Yellow CPUs.