06/08/2026
“The car feels loose.”
Or some variation of it, is one of the most common things you’ll hear from a driver trackside. It is also one of the least useful observations to work with.
It isn’t a quantity. You can’t trend it across a stint, you can’t compare it between two cars, and two engineers won’t agree on what it means.
The physics underneath is well understood. What is usually missing is a single number connecting it to what the driver is describing.
Part 2 of my Performance Through Tyre Management series looks at three ‘centroids’ as an interacting system: mass, aerodynamic load, and lateral force response.
From there it turns to the Stability Index as an objective link between balance, vehicle response, slip-angle demand and tyre energy.
An interesting concept, and elegant in its simplicity.
Full article linked in bio.