Expected repeatability

Outdoors you should be able to achieve the following repetability so long as average wind speed is less than 25% of cycling road speed.  If wind speed is above 50% we do not recommend aero testing.
For good repeatability careful setup is essential.  In particular:

• Ensure power meter is calibrated before each run.
• Make sure total mass is correct for every run.
• Carefully measure the loaded circumference of the wheels (seated roll-out).