Monaco pit lane delta explained

What "pit lane delta" actually means

The pit lane delta is a number teams calculate before every race weekend. It is the time difference between two things:

• A driver completing a normal racing lap.
• The same driver entering the pit lane on that lap, performing a stop, and rejoining the track at the pit exit.

The delta includes: pit lane entry deceleration, the 80 km/h pit lane speed limit applied across the full length of the pit lane^[2], the stationary time during the tyre change, and acceleration back out of the pit exit. It does not include the in-lap and out-lap time penalties from worn-to-new tyre transitions, which are calculated separately.

Monaco's delta is approximately 23 seconds

At Monaco the pit lane delta sits at roughly 23 seconds^[1]. This is higher than the 18-20 second range at most modern circuits.

Three reasons drive that figure:

1. Geometry. Monaco's pit lane runs along the harbour side of the circuit, and the entry and exit are tight. There is little room for a driver to brake late or accelerate early.
2. Speed limit covers a longer distance. The 80 km/h pit lane speed limit applies from the painted entry line to the painted exit line. Monaco's pit lane is among the longer ones at low speed because of the layout.
3. Pit box positioning. The pit boxes themselves are arrayed along a narrow lane with limited room for cars to manoeuvre into and out of their slot at full pit-stop speed.

How the delta shapes strategy decisions

:::analysis A 23-second delta has three meaningful effects on race strategy at Monaco:

Undercut threshold rises. A chasing driver attempting an undercut has to find more time on fresh tyres to overcome the bigger pit-lane cost. With softer compounds (C5 in 2026^[3]) that warm up quickly, the undercut still works, but the chaser has to be closer to the rival at the moment of stopping than at a typical circuit.

Safety cars become more valuable. Under a safety car, the rest of the field is also moving slowly, so the relative cost of stopping shrinks dramatically. Where a green-flag stop costs 23 seconds, the same stop under SC might cost 8-12 seconds net. That gap (a 10-15 second strategic saving) is why Monaco is famous for free-stop safety car cycles reshuffling the order.

Two-stops become impractical. A second stop adds another 23-second cost on top of the first. With negligible tyre degradation on Monaco's smooth surface, the time penalty of a two-stop almost never recovers under normal racing conditions. The two-stop usually only appears for cars recovering from incidents or strategic gambles during safety car cycles. :::

How to actually see the delta during a race

The number is rarely shown on the broadcast directly. Fans can estimate it themselves by watching:

• A car's in-lap time (the lap that ends with the pit stop) versus its previous green-flag lap time.
• A car's out-lap time (the first lap after the stop) versus its subsequent green-flag lap time.
• The combined time loss equals roughly the pit lane delta plus the new-tyre warm-up offset.

For viewers using the F1 app or third-party timing screens, the "Pit Stop" event will show the stationary time. Adding 18 seconds (the typical pit-lane drive-through portion of the delta) to that stationary number is a reasonable approximation.

Other circuits compared

Indicative pit lane deltas across the calendar (rounded, approximate):

• Monaco: ~23 seconds (one of the slowest)
• Hungaroring: ~21 seconds
• Spa-Francorchamps: ~17 seconds (one of the fastest, long straight pit lane)
• Las Vegas: ~18 seconds
• Most modern purpose-built circuits: 18-20 seconds

The delta is a property of the circuit and pit-lane geometry, not the team. All teams face the same pit-lane time loss.

Related

• What is the undercut?
• Pit window explained
• Monaco 2026 strategy guide
• Safety car