Blistering

What it looks like

Visible bubbles or torn pockets in the tread surface, often clustered on the outside shoulder of the front tyre or across the rear tyre face^[2]. From the driver's seat it feels like vibration and a sudden, sustained loss of grip on one corner of the car.

Why it happens

Heat builds inside the tyre carcass faster than it can dissipate. The compound under the tread softens, expands, and forms a gas pocket. When the pocket ruptures, the surface tears open^[1].

Common causes:

• Running a soft compound past its useful range in high track temperatures.
• High-speed circuits where energy load on tyres is sustained (Silverstone, Spa, Suzuka).
• Aggressive driving style on a hot day.
• Setup errors that overload one corner of the car (excessive camber, wrong tyre pressure).

How drivers manage

• Lift and coast on straights to bleed temperature.
• Take wider, less-loaded lines.
• Short-fill the affected stint and pit early rather than push through.

Why teams sometimes accept it

If a stint must reach a target lap to enable the strategy (e.g., to make a one-stop work) and pitting early would lose a position, teams sometimes ask drivers to manage through visible blistering. The risk is a sudden carcass failure, but for a few laps with reduced pace it can be acceptable.

Blistering vs graining

Opposite temperature problem from graining. Blistering = too hot. Graining = too cold. Both damage tread but require opposite responses.