The chemistry of grip
An F1 tyre generates grip through a combination of mechanical adhesion and molecular hysteresis. When the tyre contacts the track surface, the rubber deforms to fill the microscopic irregularities in the asphalt. This creates mechanical adhesion — the rubber literally grips the surface.
At the same time, the rubber molecules flex and deform as the tyre rotates, generating heat through a process called hysteresis. This heat softens the rubber, increasing its stickiness and therefore its grip. But there is a limit — too much heat and the rubber becomes too soft, losing its structural integrity and grip.
The operating window
Every F1 tyre has an "operating window" — a narrow range of temperatures where it performs optimally. For the soft compound, this window is typically between 90°C and 110°C. For the hard compound, it is between 100°C and 120°C.
If the tyre is below its operating window, it is too hard and cannot generate sufficient grip. If it is above its operating window, it is too soft and begins to degrade rapidly. The driver's job is to keep the tyres within this window for as long as possible.
How pressure affects performance
Tyre pressure is one of the most critical setup parameters in F1. Higher pressure reduces the contact patch, reducing grip but improving responsiveness. Lower pressure increases the contact patch, increasing grip but making the tyre more susceptible to overheating.
Teams spend hours during practice finding the optimal pressure for each compound at each circuit. A change of just 0.1 bar can alter the car's behavior by tenths of a second per lap.
The 2026 changes
For 2026, Pirelli has adjusted the compound range and modified the construction to suit the lighter, lower-downforce cars. The operating windows have shifted slightly, and the relationship between pressure and performance has changed. Teams that understand these changes fastest will have a significant advantage.