Please refer to my prior post. Stryd is off on treadmills because it is more accurate. Foot travel distance and belt speed are different. You may be exerting a 6 min mile pace at treadmill 10mph, but the foot travel differs, which is what stryd accurately measures, and why it is better than gps.

Biomechanics on a treadmill differ than outdoors running. You develop run specific power, but the movement itself is different. You can calibrate stryd to match belt speed. I get accurate paces when I calibrate stryd in zwift, however this affects other measurements and is recommended against by stryd.

If you want accurate pacing, you need a device to measure belt speed dynamically in real time, such as NPE Runn.

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Strava