F1 has a dry-race tyre-use rule, not a universal one-stop rule.

Scope: the FIA Formula One World Championship in 2026

This page applies the FIA 2026 Formula 1 Regulations: Section A, Issue 03, and the controlling tyre provisions in Section B: Sporting Regulations, Issue 08, dated 5 August 2026 and approved by the World Motor Sport Council on 3 August 2026. Section A Article A9.1.1 makes the 2026 regulations effective from 1 January 2026 for the 2026 calendar year.

The scope is the FIA Formula One World Championship. Formula 2, Formula 3, Formula E, endurance championships and national series have their own rules. Event-specific FIA and Tyre Supplier prescriptions can supplement this baseline.

Why fans call it a mandatory pit stop

A car cannot race on two tyre specifications at once. If the Race stays on dry tyres, changing from one dry specification to another is therefore the normal way to comply. In an uninterrupted dry Race, that produces at least one stop for tyres.

The regulations do not simply command “make one pit stop.” A tyre change during a Race suspension can also work, while intermediate or wet-weather use removes the two-dry-specification obligation. The legal test is tyre use, not the number shown in a strategy graphic.

Fitting a tyre is not always enough

Article B6.3.2 gives objective trigger points:

• Tyres fitted in the Pit Lane: they become “used” when the car's timing transponder shows that it has left the Pit Lane with those tyres fitted.
• Tyres fitted on the grid: they become “used” when the car leaves its grid position under its own power with those tyres fitted.
• No minimum racing-lap count: B6.3.2 does not require a full lap on the specification; it defines use by leaving the Pit Lane or grid in the stated way.
• A fitting with no departure: putting on another specification during a red flag does not by itself make it used if the Race never resumes and the car never leaves with it.

Do not confuse a new set with a new specification

Article B6.2.2 defines a complete set as two front and two rear tyres of the same specification. B6.3.3 normally requires complete allocated sets, although tyres from sets of the same specification may be mixed after Qualifying.

A second set of mediums is still the same specification. Conversely, a set containing differing specifications is not counted when officials assess how many specifications were used in the Race under B6.3.1. The rule is not about whether the rubber is new or used; it is about legal, allocated tyre specifications that meet the FIA's definition of use.

A wet Safety Car start has a separate instruction

Under B6.3.7, wet-weather tyres are compulsory when formation laps start behind the Safety Car under B5.10.1a, and when a suspended Race resumes under B5.15.2a after the Race Director orders the wet-weather procedure. They remain compulsory until the Safety Car's orange lights are extinguished and it returns to the Pit Lane.

Changing to a different specification or using another specification while the Safety Car remains on track in that procedure brings a prescribed Stop-and-Go Penalty. This is not the ordinary rule for every Safety Car period; it is tied to the specified wet start or resumption procedure.

The special 30-second route is narrow

If the Race is not in the special “suspended and cannot be re-started” position, failure to comply with B6.3.6 results in disqualification from the Race results. If the Race is suspended and cannot restart, the article instead expressly adds 30 seconds to a driver who was required to use two dry specifications but did not.

Textual uncertainty: that final sentence expressly addresses failure to use two dry specifications, but does not separately state the consequence where a driver used two dry specifications and neither was a mandatory Race specification. The general disqualification sentence is itself introduced by an exception for a Race that cannot restart. Issue 08 leaves that narrow outcome unstated in B6.3.6; a published stewards' decision would control an actual case.

How to check a strategy

1. Identify the session: B6.3.6 controls the Race, not the Sprint.
2. Check Race tyre use: if an intermediate or wet-weather tyre was used, the two-dry-specification requirement does not apply.
3. List the dry specifications: count specifications, not the number of sets or stops.
4. Apply B6.3.2: confirm each claimed specification became used by leaving the grid or Pit Lane in the required way.
5. Check the event notice: confirm that at least one used dry specification was one of the FIA's mandatory Race choices.
6. Check the finish procedure: distinguish an ordinary finish from a suspension after which the Race could not restart.

Shortcuts that give the wrong answer

• “Every F1 race has one mandatory pit stop.” No. The baseline is a conditional Race tyre-use rule, and a suspension change can satisfy it.
• “Every dry race requires the hard tyre.” No. The FIA identifies the mandatory Race specification or specifications for that Competition.
• “Two mandatory specifications means both must be raced.” No. B6.3.6 requires at least one of the mandatory choices within the driver's two-specification combination.
• “Any rain cancels the rule.” No. The exception turns on the driver actually using an intermediate or wet-weather tyre during the Race.
• “A new set is a different compound.” No. A second set of the same specification does not create a second specification.

Do not carry an expired event rule forward

An earlier 2026 rulebook, Section B Issue 04 dated 10 December 2025, contained a Monaco-only requirement to use at least three sets of tyres during that Race, alongside the dry-weather two-specification rule. The current Issue 08 no longer contains that paragraph: B6.3.6 now states the same baseline for every Race.

Use the rules version in force at the time when analysing the completed 2026 Monaco Grand Prix. Do not treat that event-specific three-set provision as a standing rule for later Grands Prix or future Monaco events unless the FIA publishes it again.

Continue through the Race procedure

• Pit stops and unsafe release explain the separate safety duties during a tyre change.
• Wet-weather tyres and standing starts cover the wider rain procedure.
• Safety Car, VSC and red flags explain neutralisation and suspension.
• Qualifying and Sprint rules distinguish Alternative Format weekends from the Race requirement.
• Formula 1 rules in five minutes gives the championship overview.