4iiii Bike

Frequently Asked Questions

• What is the 4iiii PRECISION 3+ and what technologies give it its accuracy?

  PRECISION 3+ is a crank-arm power meter that uses 4iiii’s patented 3D strain gauge technology to measure lateral bend, pull and twist across the full pedal stroke, delivering laboratory-grade accuracy (±1% in independent testing). It also uses Automatic Terrain Selector to switch between accelerometer and gyroscope sensing for stable readings on smooth roads, rough gravel and high‑RPM sprints, and streams raw ANT+/Bluetooth power and cadence data to head units and apps.
• How do I know if a PRECISION 3+ pod will fit my crank arm?

  PRECISION 3+ pods are ultra-low profile (under ~5.5 mm thick) and are designed to mount on most common alloy and carbon crank arms, with Ride Ready versions pre-installed on supported crank models. Before buying, verify your crank make/model against 4iiii’s compatibility list and confirm whether you need a left-only pod or the paired/dual option for your crank geometry.
• Should I buy a left-side PRECISION 3+ or go dual-sided?

  Choose left-side PRECISION 3+ if you want a lightweight, cost-effective single-leg power measurement (pod ~9–10 g); choose the dual system if you need left/right balance, leg-specific training metrics and full-power data from both cranks (dual adds ~29 g total). Dual-sided setups unlock advanced metrics like torque effectiveness and pedal smoothness per leg, while single-sided is a great upgrade for riders prioritizing low mass and simple power-based training.
• How does the PRECISION 3+ compare to the original PRECISION model?

  PRECISION 3+ builds on the original PRECISION’s proven ±1% accuracy with enhanced sensor switching (Automatic Terrain Selector) that adds gyroscope-assisted measurements for rough terrain and sprints, improved connectivity and feature updates like Apple Find My support. The 3+ keeps the same crank‑pod installation philosophy and low mass but adds firmware and sensor refinements for more consistent outdoor performance.
• How durable is the PRECISION 3+ and what is the battery/change cadence like?

  PRECISION 3+ pods are engineered for off‑road and wet conditions (IPX7/IP65-rated exposure in real-world tests including rain, mud and salt), and include active temperature compensation so readings remain stable across weather and temperature swings. The units use a low-power design with long battery life in typical use and user-serviceable batteries for easy roadside swaps when needed.