F1 tyre compounds explained

The six dry compounds

Pirelli's 2026 F1 range runs from C0 (hardest) to C5 (softest). Each compound is a different rubber formulation with a different balance of grip and durability^[1]:

• C0: hardest. Slowest single-lap pace, longest stint life. Reserved for the most severe circuits (high-speed corners, high downforce, hot ambient).
• C1: hard. Used at high-energy circuits where C0 would be too durable to be relevant.
• C2: hard-medium. Common race compound at mid-energy circuits.
• C3: medium. The most-used compound across the calendar, suitable for the largest range of conditions.
• C4: medium-soft. Best balance of pace and stint length at low-medium energy tracks.
• C5: softest. Highest grip, shortest stint life. Used at street circuits and low-degradation venues.

How a weekend's compound selection works

For each race, Pirelli announces three compounds from the C0-C5 range. Those three are designated as that weekend's Hard, Medium, and Soft^[1]. Drivers refer to them as Hard / Medium / Soft for the rest of the weekend, even though the underlying compound code varies.

For example, Monaco 2026 brings C3 (Hard), C4 (Medium), C5 (Soft)^[3]. Spain 2026 typically brings harder compounds because of the high-energy corners.

The numbering can confuse fans: the "Hard" at Monaco (C3) is the same compound as the "Medium" at Spain. This is intentional. Pirelli grades each compound relative to the others at that weekend, not absolutely against the season.

The colour code

Compound colours are universal across the season^[2]:

• White: Hard
• Yellow: Medium
• Red: Soft
• Green: Intermediate (wet to damp)
• Blue: Wet (heavy rain)

So a yellow sidewall stripe at Monaco means C4 (the Medium for that weekend); at Spain it would mean a different compound code carrying the same Medium designation.

What softer compounds give and cost

:::analysis A softer compound provides:

• Faster qualifying lap (typical advantage of 0.3-0.8 seconds per compound step).
• Better grip in slow corners and on cold tracks.
• More aggressive warm-up (the tyre comes into its working window in fewer laps).

A softer compound costs:

• Shorter stint life before the cliff (see tyre degradation).
• Higher thermal degradation in hot conditions.
• More susceptibility to graining at the start of a stint if the tyre is below temperature.

The harder end of the range inverts each of these. :::

Mandatory compound use in dry races

In a dry race, F1 regulations require each driver to use at least two of the three available dry compounds (Hard, Medium, Soft) during the race^[1]. The rule forces at least one pit stop and prevents teams from running a single soft compound across the whole race.

In wet races (declared by the FIA), this requirement is waived; drivers can run a full race on Intermediates or Wets without a dry-compound stint.

How teams choose

Strategy decisions on compound use are made during Friday practice, where teams run long stints on each compound to build a degradation model. By Saturday morning, each team has a prediction of:

• Stint length on each compound (laps before the cliff).
• Pace delta between compounds (seconds per lap).
• Optimal one-stop and two-stop strategies given those numbers.

The race strategy is the combination of those numbers with the qualifying grid position. Front-runners often favour a "soft start" to defend track position into the first stint; mid-pack runners may "hard start" to undercut on a lap when front-runners are still on softs.

The intermediate and wet tyres

The Intermediate (green) is designed for damp-to-light-wet conditions, with a tread pattern that displaces water at moderate speeds. It crosses over from useful to a liability around the moment a dry line forms and the medium becomes faster.

The Wet (blue) is for heavier rainfall. It clears far more water per lap (around 65 litres per second at racing speed at full distribution) but heats up rapidly on a drying line and degrades in seconds when conditions clear.

Race Control declares which compounds are mandatory in changing weather, and drivers must adapt strategy in real time.

Related

• Tyre degradation
• Graining, blistering
• What are the strategies in F1?
• Monaco 2026 strategy guide