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.