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a Mountain Bike World Champion
this crank-based power meter provides the consistent data you need to unlock your potential
With the Factory Install Dual Upgrade
automatic terrain selection
the Viiiiva is engineered for comfort and extreme durability
4iiii PRECISION 3+ PRO Dual-Sided Powermeter - Factory Install Select Your Crank Model:Shimano - Ultegra FC-08 a Mountain Bike World ChampionThe 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