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Specifications

  • Measurement: Single-sided (left)
  • Accuracy: +/-1%
  • Battery Life: Up to 800 hours (CR2032)
  • Connectivity: Bluetooth + ANT+
  • Compatibility: Shimano XTR FC-M9100
  • Crank Length: 170mm
  • Apple Find My: Yes
  • Warranty: 3 years

FAQ

Is the 4iiii Precision 3+ accurate enough for mountain biking?

Absolutely. The automatic terrain selector continuously adjusts for rough terrain, technical sections, and variable cadence, keeping your power data accurate even on the gnarliest singletrack.

Can I use the 4iiii Precision 3+ with my Garmin or Wahoo head unit?

Yes, it broadcasts over both Bluetooth and ANT+ simultaneously, so it pairs with Garmin, Wahoo, Hammerhead, and any other cycling head unit or training app without issue.

Is single-sided power measurement good enough for training?

For the vast majority of cyclists, single-sided measurement provides plenty of data to train effectively by power zones, track fitness, and pace efforts. Dual-sided is primarily useful for identifying specific left-right imbalances.

Best For

XC and marathon mountain bikers running Shimano XTR FC-M9100 who want accurate, lightweight power data without a full drivetrain overhaul.

4iiii Precision 3+ - Shimano XTR FC-M9100 | 170mm Reviews:

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