John was invited back to the Endurance Innovation podcast to discuss various aerodynamic testing tools, methodologies, and the real-world challenges of measuring and interpreting CdA data in outdoor cycling — covering everything from the Streamlines wind and rider position sensing to the pitfalls of real-time CdA display, and rounding off with a look at the effect of tyre temperature on rolling resistance.

Listen to the episode here

Erratum:

After listening to the podcast, John realised that he gave incorrect figures for the wattage standard deviations during the episode. The best outdoor tests currently achieve standard deviations of approximately 0.8 W. We do have some indoor tests from the Catesby tunnel with even better resolution which we will publish shortly.

See here for the disc test