4iiii PRECISION 3+ PRO Dual-Sided Powermeter - Ride Ready Crankset:Shimano - Dura-Ace FC-R9200 170mm (54/40T) The 4iiii Viiiiva is a

The 4iiii Viiiiva is a precision heart rate monitor designed to capture the most accurate picture of your internal physiological effort

Built for athletes of all abilities

or climbing the virtual mountains of Zwift

you send us your compatible crank arm

we install the power meter

4iiii PRECISION 3+ PRO Dual-Sided Powermeter - Ride Ready Crankset:Shimano - Dura-Ace FC-R9200 170mm (54/40T) The 4iiii Viiiiva is aThe 4iiii PRECISION 3+ PRO Powermeter is our most advanced power meter, offering the ultimate combination of dual sided accuracy, durability, and lightweight design. Whether you are a Tour de France pro, a Mountain Bike World Champion, Ironman triathlete, a Zwift racer, or a cyclist looking to analyze left right balance to optimize your pedal stroke, this dual sided crank based power meter provides the comprehensive data you need to unlock your