F1 strategy glossary

Blistering is a tyre failure mode where bubbles of overheated rubber form under the tread and rupture, leaving raised pockmarks on the surface. It is caused by the tyre running above its operating temperature window. Blistered tyres lose grip and can fail catastrophically if the damage spreads.

DRS is a driver-controlled flap in the rear wing that opens to reduce drag on designated straights. It is available to a chasing driver only when they are within one second of the car ahead at a detection point, and only in marked DRS zones. The goal is to make overtaking on straights more achievable.

Graining is a tyre wear pattern where small rubber particles tear off the tread and reattach in beads on the surface. It happens when a tyre is sliding more than it is gripping, typically because temperature is below the working window. Graining costs grip and lap time until the affected layer wears clean.

The overcut is the inverse of the undercut. A driver stays out longer than a rival who has already pitted, using the speed advantage of clear air on still-functional tyres while the rival fights warm-up and traffic on cold fresh tyres. When the long-staying driver finally pits, they emerge ahead.

A pit window is the range of laps during which a driver can pit and still execute their planned race strategy. It is bounded on one side by tyre degradation (cannot stay out longer) and on the other by stint-length minimums or rivals' positions (cannot pit sooner without losing track position).

The safety car is a road car driven on track to neutralise the race when conditions are unsafe. All competing cars must form a single-file queue behind it, no overtaking is allowed, and lap times slow dramatically. It is deployed by Race Control under FIA International Sporting Code procedures.

Tyre degradation is the loss of grip and consistent lap-time performance as a tyre is used. It comes from two mechanisms: thermal degradation (the rubber overheats and loses grip across the surface) and mechanical wear (the tread physically erodes). Both progress over a stint and ultimately produce the tyre 'cliff' where lap times collapse.

The undercut is when a driver pits earlier than the car ahead, fits fresh tyres, and uses the immediate pace advantage to overtake on track once the rival pits a lap or two later. It exploits the gap between worn-tyre and new-tyre lap times during the few laps a stop creates.

The Virtual Safety Car neutralises a race by forcing every car to drive to a delta-time below a target, rather than physically deploying a car on track. The field stays spread out, overtaking is forbidden, and pit stops cost less time than under green flag but more than under a full safety car.