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4iiii Precision Pro Crankset Powermeter Shimano Dura Ace R9200. With exceptional accuracy and reliability, the Precision Pro power meter has already proven itself in use in demanding competitions, whether it’s the mountain finish of Alpe D’Huez in the Tour de France or the run along the Queen K Highway during the Ironman World Championships in Hawaii. Thanks to 4iiii’s patented 3D strain gauge technology, which provides +/-1% accuracy, athletes get accurate data when they need it most. Whether training or racing, the Precision Pro power meter provides road cyclists and triathletes with the most accurate results. Through the use of two sensors, left/right balance is also recorded, from which statements can be made about pedaling uniformity and torque effectiveness. Equipped in this way, the Precision Pro power meter becomes the ultimate training tool to help every cyclist reach their personal goals. Ready to ride. The 4iiii powermeter sensor delivery is already pre-mounted on the Shimano crankset selected for Hollowtech II bottom brackets. After installation on the bike* and connection to the control unit or computer, you can immediately start recording power.