In this episode of Performance Process, we finally dig into the tyre-testing project that quietly consumed most of my year.

Nine months, six tyre widths, hundreds of test runs, three road surfaces, four identical wheelsets, and far too many cold late-night tests than any sane person should attempt. But it was worth it.

Today, Ronan is joined by John Buckley the founder of Streamlines Aero, the company behind the hardware and technical support so crucial to this testing. Together, we break down how the test protocol worked, why it’s different, and why those differences matter. We also unpack the major findings: why pressure mattered more than width in this dataset, why some long-held assumptions didn’t hold up in the real world, and how tyre temperature turned out to be one of the biggest and least appreciated variables affecting performance.

This is just the beginning. Later in the episode we explain where our tyre testing goes from here and what to expect in the new year.

For years, cyclists have said, “you can’t see aero.” Now Dan Bigham can.

In this episode, we go inside Red Bull–Bora–Hansgrohe’s groundbreaking use of Particle Image Velocimetry (PIV), a laser-based imaging technique that effectively makes airflow around a rider visible in 3D. Dan joins Ronan and the CyclingSpy to explain how the team used helium bubbles, high-speed cameras, and class-IV lasers inside Catesby Tunnel, an old railway tunnel, to capture the first-ever full-field airflow data behind a cyclist.

We unpack what PIV actually is, how it bridges CFD and real-world testing, and what it could mean for the future of aerodynamic development in cycling. From vorticity maps to quantum computing, this one’s a deep dive into the tools shaping the next generation of aero performance.

In this episode, Ronan applies the Performance Process philosophy to help Marcus Christie, one of the most successful Irish time trialists ever, to reimagine how to train, test, and race.

Ronan and Marcus dive into the complete optimisation process behind Marcus's Nationals campaign. From bike fits and wind tunnels to injury management, heat strategies, nutrition, and radio-guided pacing, this is the inside story of how process can transform performance.