Canadian firm 4iiii Innovations is now selling its Precision Pro dual-sided power meter, which only adds 25g to a crankset, the company claims. As with the company's left-side-only Precision, you can send in your current crankset and 4iiii will install the meter onto it (called Factory Install), or you can buy what 4iiii calls Ride Ready — a new crankset with a meter installed. The Dura-Ace 9000 Precision Pro goes for $749 (about £570) with the Factory Install option. Ride Ready Dura-Ace 9000 cranks are $1,499 (about £1,140).
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The Precision Pro has strain gauges on both arms for distinct right and let power measurement. It works on both ANT+ (for most head units like Garmin Edge devices) and Bluetooth (for smartphones). The firmware is upgradeable over Bluetooth with the 4iiii iOS and Android apps.
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Stages was the first company to offer a crank-based power meter with strain gauges in the left arm. 4iiii followed, and now Pioneer also has a left-arm meter. Garmin's pedal-based Vector 2 has a left-side-only option (the Vector 2S), and Rotor's INpower measures on the left. In each of the products, the left-side measurement is doubled for a total wattage number.
Some other power meters, such as SRM, Quarq or Power2Max, measure the input from both legs, but not distinctly. Quarq and Power2Max offer left/right calculations, based on where in the stroke power is applied, but not actual measurements for each leg.
With this dual-leg system, 4iiii joins like likes of Pioneer, Verve InfoCrank and Garmin Vector with distinct left/right measurement.
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