Aero testing usually brings wind tunnels, maths equations, and general nerdery to mind. It's time-consuming, requires patience, and a hassle many can't be bothered with. But still, it shapes many of the products we buy today; thus, it affects all our riding.

In this episode, Ronan sits down with John Buckley – former F1 aerodynamicist and founder of Streamlines – to explore how real-world aero testing is changing testing for the performance-minded and it's adoption within the industry.

From F1 aerodynamics to cycling performance, John shares the journey behind building an outdoor aero testing platform now used by WorldTour teams, bike fitters, and equipment developers.

They unpack why outdoor testing matters, how teams and fitters are already using it, and what it could mean for everyday riders looking to ride faster without guesswork. They explore the limitations of wind tunnel testing, the unique challenges of outdoor measurement, and how the Cirrus system automates and simplifies testing.

Whether you're a performance-minded cyclist, a curious bike fitter, or just want to know what's actually making you faster, this episode breaks down cutting-edge tech in a way that's actionable, thought-provoking, and accessible.