4iiii

Frequently Asked Questions

• Which Shimano cranksets and bike types are 4iiii PRECISION 3+ power meters compatible with?

  They fit common Shimano cranksets such as 105, Ultegra, Dura‑Ace and GRX when matched to the correct model, and are designed for road, gravel, and mountain biking. The ultra‑low profile (about 40% thinner) helps clearance on tight frames; choose Ride Ready pre‑installed options or confirm your Shimano model for a factory install and perform a zero‑offset calibration in the 4iiii app after installation.
• How does the PRECISION 3+ PRO compare to the PRECISION 3+?

  Both use 4iiii’s patented 3D strain gauge technology with ±1% accuracy and offer ANT+ and Bluetooth SMART connectivity, cadence via a built‑in accelerometer, and active temperature compensation. The PRECISION 3+ PRO is a dual‑sided system that delivers left/right balance and more detailed torque metrics on both legs, while the PRECISION 3+ is typically offered as a left‑side (single) unit or Ride Ready option for a lighter, simpler install and solid single‑leg power data.
• Should I choose a left‑side (single) power meter or a dual‑sided PRECISION 3+ PRO?

  Pick dual‑sided PRECISION 3+ PRO if you need left/right balance, torque effectiveness, and the most detailed pedal analysis for racing or detailed performance work; a left‑side PRECISION 3+ or PRECISION 3 is a great choice if you primarily want accurate total power and cadence with minimal weight and cost. Both approaches deliver ±1% accuracy across road, gravel, and MTB, so your decision should be based on the depth of data you want rather than baseline measurement quality.
• What training metrics and connectivity do 4iiii PRECISION 3+ power meters provide?

  They deliver precise power, cadence from the accelerometer, left/right balance, pedal smoothness and torque effectiveness, with data sent over ANT+ and Bluetooth SMART to bike computers, watches, and apps. Features like active temperature compensation, OTA firmware updates, and LED indicators (wake/zero/low battery) make data collection and device maintenance straightforward.
• How do I install and maintain a PRECISION 3+ and what is the battery life?

  Installation is straightforward: opt for Ride Ready pre‑installed Shimano cranks or a factory install on your existing crank arm, then perform a zero‑offset calibration in the 4iiii app to ensure accurate readings; the ultra‑low profile design reduces clearance issues. The meters use a CR2032 coin cell with approximately 550–800 hours of runtime, are IPX7 water‑resistant, and include LED indicators to show wake, zero and low battery status.