In-lap and out-lap

In-lap

The in-lap is the lap that ends with the car turning into the pit lane. The driver must:

• Maintain race pace through the early part of the lap to avoid being caught by chasing cars.
• Identify the pit-lane entry point (often the entry to the final corner sector).
• Decelerate from racing speed to the 80 km/h pit lane limit at the painted line.
• Manage the rest of the lap inside the pit lane to the pit box.

A clean in-lap typically loses 2-5 seconds to a normal racing lap, depending on the circuit's pit-lane geometry. The driver wants the in-lap to be as fast as possible to extract the maximum value from the undercut strategy.

Out-lap

The out-lap is the lap that begins as the car exits the pit lane on fresh tyres. The driver must:

• Bring brand-new tyres up to operating temperature (the cold tyre at this moment has roughly 30-50% of its peak grip).
• Avoid sliding excessively, which would create graining.
• Navigate any traffic on the racing line ahead.
• Build pace progressively across the lap as the tyres warm up.

A typical out-lap is 1-3 seconds slower than a normal racing lap. The exact penalty varies by compound (softs warm up fastest, hards slowest), by track temperature, and by driver style^[2]. The out-lap is the most vulnerable period to defensive overcutting from a rival who stayed out a lap longer. See overcut.

Why these laps matter to strategy

:::analysis The undercut and overcut strategies both pivot on what happens during in-laps and out-laps:

• Undercut: The chasing driver's in-lap on still-fresh-enough tyres is fast; their out-lap on new rubber is faster than the rival's in-lap on now-worn tyres. The cumulative gain over those two laps is enough to leapfrog.
• Overcut: The chasing driver stays out and runs at racing pace while the rival is on a slow out-lap warming up new tyres. The gap closes naturally; when the chaser eventually pits, their own out-lap penalty is offset by the time gained while the rival was warming up.

Both strategies are built around the small but consistent time gap between in-lap pace, out-lap pace, and normal racing pace. Strategy teams model these deltas for every compound at every circuit during Friday practice^[2]. :::

Where you'll hear them on race radio

• "Push in-lap, push push": the team wants the driver to extract maximum pace from the lap ending in the pit stop, to extend an undercut.
• "Manage the out-lap": the team wants the driver to bring fresh tyres up to temperature without sliding, accepting the small early pace loss in exchange for clean tyre warm-up.
• "Box this lap": the lap currently being driven IS the in-lap; pit at the end of it.
• "Stay out": do not pit yet; this lap is not an in-lap.

Related

• Stint
• Pit window
• Undercut
• Overcut