4iiii

Precision 3+ Power Meter XT M8100

The 4iiii Precision 3+ Power Meter for Shimano XT M8100 delivers reliable, real-world power data for training, pacing, and fitness tracking on MTB and gravel setups where durability and battery life matter. With Apple Find My support built in, it also adds a practical layer of security for riders who travel, race, or regularly transport their bike.

Power, cadence, and calorie data are transmitted in real time to a compatible head unit or training app over ANT+ and Bluetooth, with a wide operating window for both cadence and power output.

Power meter advantages that matter on the trail

1. Apple Find My Integration - Helps locate the power meter on a map when it’s not in use, using iPhone, iPad, Mac, or Apple Watch (Find Items)
2. ±1% Accuracy - Supports consistent training zones and repeatable efforts without chasing fluctuating numbers
3. Up to 800 Hours on a CR2032 - Long service intervals with a common coin-cell battery for straightforward replacements
4. Low-Profile, 9g Design - Minimal added weight and reduced exposure to trail strikes compared to bulkier add-on sensors
5. Broad Operating Ranges - 30–170 RPM cadence range and 0–4000 W power range cover everything from steep grinds to sprint efforts

Finished with a waterproof build, an indicator light for quick status checks, and a 3-year warranty, the Precision 3+ is a practical upgrade for riders who want dependable power-based training on an XT M8100 drivetrain without adding complexity.