What the undercut is
The undercut is the most common strategic move in modern F1. When Driver A is stuck behind Driver B and cannot overtake on track, Driver A pits early for fresh tires. The fresh tires give Driver A a significantly faster lap for the one or two laps before Driver B also pits. When Driver B eventually stops, they rejoin behind Driver A.
The undercut works because a new tire is dramatically faster than a tire that has been used for 15 or 20 laps. The time gained on that one fast out-lap is often enough to cover the time lost in the pit stop itself and still come out ahead.
What the overcut is
The overcut is the opposite. Driver A stays out on track while Driver B pits. Driver A then pushes hard on the next lap or two on their older tires, trying to build enough of a gap that when they eventually pit, they rejoin ahead of Driver B.
The overcut works when the older tire is still performing well — when degradation is low and the track position is more valuable than the fresh tire advantage. It is harder to execute than the undercut because it requires the driver to extract maximum performance from a tire that is past its prime.
What decides which one works
Tire degradation is the single most important factor. If a tire degrades quickly, the undercut is powerful because the fresh tire advantage is massive. If a tire degrades slowly, the overcut becomes viable because the older tire can still produce competitive lap times.
Track position matters too. On circuits where overtaking is difficult, like Monaco, teams will do almost anything to maintain track position, which makes the overcut more attractive. On circuits where overtaking is easier, like Spa, the undercut is often the preferred weapon.
How teams execute in real time
Strategy is not decided before the race. It is decided lap by lap, based on real-time data. Engineers monitor tire temperatures, degradation rates, traffic patterns, and the gap between the cars. The strategist on the pit wall runs simulations in real time, comparing the undercut and overcut options and recommending the one that gains the most positions.
The driver's feedback is critical. If a driver reports that the tires are "gone" or "sliding everywhere," the team knows the undercut will be powerful. If the driver says the tires are "still good" and "I can push," the overcut may be the better option.
Why strategy decides races
In modern F1, the fastest car does not always win. The best-strategized car often does. A team that reads tire degradation correctly, calls the undercut at the right moment, and avoids traffic on the out-lap can beat a faster car that made the wrong call.
This is why the pit wall is just as important as the cockpit. The strategist who makes the right call at the right time can win a race that the driver could not win on track alone.