The 4iiii 105 7100 Precision 3+ Powermeter

The 4iiii Precision 3+ Powermeter crank arm for Shimano 105 FC-R7100 brings pro-level power data to your ride in a lightweight, ultra-compact design. With ±1% measuring accuracy, up to 800 hours of battery life, and seamless compatibility with ANT+ and Bluetooth Smart, it delivers the reliable performance ambitious cyclists need for structured training and race-day preparation.

Built for riders chasing every watt, the Precision 3+ uses 3 strain gauges to measure the forces in your pedal stroke with exceptional precision. The automatic terrain selector adapts to changing conditions for more responsive cadence and power feedback, while the 5.5 mm low-profile design helps ensure broad frame compatibility.

Apple Find My integration adds extra peace of mind by letting you track the location of your power meter when it is not in use. Combined with an IPX7 waterproof rating, a lightweight 9 g construction, and a 3-year warranty, this power meter is made to perform reliably in tough real-world conditions.

Whether you are training indoors on Zwift, TrainerRoad, Wahoo SYSTM, or Rouvy, or riding toward your next KOM or Ironman, the 4iiii Precision 3+ gives you the precise data you need to train smarter and ride stronger.

Key Features

• ±1% accuracy with 3 strain gauges for precise left-side power measurement
• Up to 800 hours battery life with CR2032 coin cell
• Apple Find My support for easy location tracking
• Automatic Terrain Selector for responsive feedback on varied roads
• Ultra low-profile 5.5 mm design for improved frame compatibility
• Only 9 g sensor weight
• IPX7 waterproof rating for dependable all-weather use
• Compatible with ANT+ and Bluetooth Smart

Specifications

• Type: Non-drive side
• Compatibility: Shimano 105 FC-R7100
• Crank arm lengths: 165 mm, 170 mm, 172.5 mm, 175 mm
• Accuracy: ±1%
• Power range: 0–4,000 W
• Cadence range: 30–170 rpm
• Battery: CR2032
• Operating temperature: 0–50 °C
• Storage temperature: -40 to 60 °C
• Material: Aluminum
• Manufacturer number: PML300-S23A00X