19/09/2026
Flat or underinflated tyres run much hotter than over inflated tyres.
The physics is straightforward:
Underinflated:
The tyre collapses slightly and the sidewalls flex far more with every rotation.
That flexing is hysteresis - the rubber is constantly bending and straightening, which creates internal friction and heat.
The contact patch gets bigger and flatter, so there is more rolling resistance and more rubber scrubbing on the road.
Less air inside also means less volume to absorb and carry heat away.
On a steady motorway run, an underinflated tyre can be 20-40°C hotter than a correctly inflated one.
This is why underinflation is the number one cause of heat-related blowouts, especially in summer.