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Elevate your riding experience with dual-sided power for our most advanced features and an in-depth look at your data
The 4iiii Viiiiva is a precision heart rate monitor designed to capture the most accurate picture of your internal physiological effort
Replacement PRECISION 3 & 3+ Powermeter cap and O-ring
and an industry-leading 800-hour battery life
the PRECISION 3+ is your dedicated performance tool for years to come
4iiii PRECISION 3+ PRO Dual-Sided Powermeter - Ride Ready Crankset:Shimano - Ultegra FC-R8100 170mm (50/34T) Elevate your riding experience withThe 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
