4iiii Precision Pro dual-sided power meter starts shipping

Power meter sold in two ways: on your crankset or on a new crankset

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).

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.

Tom Boonen and the rest of Etixx-Quick Step have been racing on Precision Pro meters this year
Tom Boonen and the rest of Etixx-Quick Step have been racing on Precision Pro meters this year

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. 

“Power helps riders focus on how their body responds to training, " said Karel Bergmann, 4iiii's Precision product manager. "While single-sided power meters meet the needs of most riders, dual-sided power provides an extra level of data for those who are fine tuning their training or monitoring strength progressions during recovery from an injury.” 

This is Boonen's Precision Pro that he used at the 2016 Paris-Roubaix, where he placed second
This is Boonen's Precision Pro that he used at the 2016 Paris-Roubaix, where he placed second

Ben Delaney

US Editor-in-Chief
Ben has been writing about bikes since 2000, covering everything from the Tour de France to Asian manufacturing to kids' bikes. The former editor-in-chief of VeloNews, he began racing in college while getting a journalism degree at the University of New Mexico. Based in the cycling-crazed city of Boulder, Colorado, with his wife and two kids, Ben enjoys riding most every day.
  • Discipline: Road (paved or otherwise), cyclocross and sometimes mountain. His tri-curious phase seems to have passed, thankfully
  • Preferred Terrain: Quiet mountain roads leading to places unknown
  • Current Bikes: Scott Foil Team Issue, Specialized S-Works Tarmac, Priority Eight city bike... and a constant rotation of test bikes
  • Dream Bike: A BMC Teammachine SLR01 with disc brakes and clearance for 30mm tires (doesn't yet exist)
  • Beer of Choice: Saison Dupont
  • Location: Boulder, CO, USA

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