4iiii Precision 3+ - Shimano XTR FC-M9100 | 170mm
Power Meter
4iiii Precision 3+ - Shimano XTR FC-M9100 · 170mm
4iiii Precision 3+ - Shimano XTR FC-M9100 | 170mm
Why XC Racers Choose the 4iiii Precision 3+ for Shimano XTR
Mountain bikers who train with power have a real advantage on race day, and the 4iiii Precision 3+ makes that accessible without the bulk. Read the overview
At a glance
- Accuracy
- +/-1%
- Connectivity
- Bluetooth + ANT+
- Measurement
- Single-sided (left)
- Battery
- Up to 800 hours (CR2032)
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Overview
Why XC Racers Choose the 4iiii Precision 3+ for Shimano XTR
Mountain bikers who train with power have a real advantage on race day, and the 4iiii Precision 3+ makes that accessible without the bulk. Designed to bolt directly onto your Shimano XTR FC-M9100 crank arm, it adds virtually no weight while delivering +/-1% accuracy across every terrain type. Apple Find My support means your powermeter is trackable if a crash sends it flying, and Bluetooth plus ANT+ dual transmission ensures seamless pairing with Garmin, Wahoo, or whatever head unit you roll with.
The automatic terrain selector is a standout feature for mountain bikers specifically, continuously recalibrating cadence detection as you move between flowy singletrack, steep punchy climbs, and technical descents. Up to 800 hours of battery life from a single CR2032 means you will not be thinking about swaps for months at a time, and 4iiii's 3-year warranty has you covered for the long haul. At 170mm, this is the right tool for XC and marathon racers who want real power data dialed in to their Shimano XTR build.
All the specs
- Measurement
- Single-sided (left)
- Accuracy
- +/-1%
- Battery Life
- Up to 800 hours (CR2032)
- Connectivity
- Bluetooth + ANT+
- Crank Length
- 170mm
- Apple Find My
- Yes
- Warranty
- 3 years
Works with
- Shimano XTR FC-M9100
FAQ
Good questions
Get to know 4iiii
There's more to 4iiii than this one product. Our 4iiii page has the full 4iiii lineup we carry and more about the brand.
Visit the 4iiii page →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.
Reviews
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