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How to get a perfect power reading
Power = Speed x Force.
To get accurate power reading you need:
- Good speed sensing
- Good force sensing
Speed
Your wheel speed is Distance (# of wheel rotations x circumference of the brake rim) over Time. To ensure you're getting an accurate speed reading,
- Install one speed index, and slide it towards your wheel rim.
- Update your wheel rim circumference in the 4iiii app if your wheel size is not the default 700c (29" MTB).
Force
Your resistance unit is mounted directly on a load cell which measures force. It weighs itself automatically on start-up, to ensure an accurate calibration. Because there's no wear parts influencing the accuracy of Fliiiight's power measurement, this is the only force calibration needed.
See also: Troubleshoot Speed readings: Master Article
Troubleshoot power readings
My power readings don't match another powermeter
Two powermeters with different methods of measurement are unlikely to report identical instantaneous readings, even if they are identical when averaged. Here's a few reasons two powermeters can disagree on average:
- Measuring power at the crank (i.e. a 4iiii Powermeter) vs measuring at the wheel (Fliiiight): Both readings may be correct for the thing they are measuring, but a crank mounted powermeter measures your power before small losses due to inefficiency in the drive train, and a trainer measures it after. This difference in measurement should result in very small differences in average power, in a consistent direction.
- If your left/right power balance changes throughout your ride (common with fatigue), the measurements from a single-sided powermeter can diverge from the trainer, which measures the average of both legs.
- One of the powermeters may be miscalibrated.
Fliiiight has highly accurate power measurement (+/- 1%), however, if you wish you can calibrate Fliiiight to match another powermeter, for consistency between your indoor and outdoor rides.
My power reads 0
In order to connect to the app:
- Make sure the trainer is on.
- Make sure Bluetooth or ANT+ are enabled on your device.
- Check that your app is compatible.
- Check the app’s user guide or support resources for assistance connecting to and navigating your individual app.
If you are connected, but Fliiiight does not report power, or engage the magnets,
- Install one (1) speed index.
- Use the "Trainer Sensors" troubleshooting tool in the 4iiii app, or check out the general troubleshooting tips for Fliiiight not detecting your wheel.
If this problem started part-way through your ride, start here:
- Troubleshoot your Bluetooth Connection or ANT+ Connection and check for interference.
- Make sure the trainer is on. If it has very low batteries it may have turned off on its own. Charge the trainer.
My power readings are all over the place
- Make sure no wires or objects are pressing against the resistance unit, as this could affect the reading.
- Contact support. This could be an indication of physical damage to the strain gauge.