Too tough for their own good? How F1 tyres work in 2026

Tyres are the only part of a Formula 1 car that touches the track. For 2026 they were shrunk to fit the new cars and Pirelli dropped its softest compound, and in the opening rounds they lasted so well that one-stop races were the rule. This guide explains how the rubber works and what to look out for when F1 reaches Texas.

Smaller rubber for smaller cars

The new cars are narrower and lighter, so the tyres shrank with them. The wheel rims are still 18 inches, but the tread is 25mm narrower at the front and 30mm narrower at the rear, and the overall diameter is down by 15mm at the front and 10mm at the rear. Pirelli says the four tyres on each car weigh 1.6kg less than last season's.

The range shrank too. Last year Pirelli had six dry compounds, C1 to C6. For 2026 it decided not to validate the C6, because testing showed the time gap between it and the C5 was "too small compared to the others". That leaves five slicks, C1 (hardest) to C5 (softest), plus the green intermediate and blue full wet for rain.

Pirelli had a problem from the start, because it could not test these tyres on actual 2026 cars. It used mule cars modified to mimic the new machines, along with simulations of the loads and speeds the teams predicted for the end of the 2026 season. The tyres were aimed at the cars the teams expected to be running in October, rather than the ones that turned up in March.

Three from five, and the colour code

Pirelli brings three compounds to each race, choosing the hardest trio for circuits that punish tyres and softer ones where the demands are lower. Whatever their numbers, the softest of the three gets a red stripe and is called the soft, the middle one is yellow and called the medium, and the hardest is white and called the hard. So the C4 was a medium in Singapore and will be a soft in Austin.

Softs give the most grip, but only for a short time before they degrade, which makes them ideal for qualifying. Hards last much longer but are slower. On a normal weekend each driver gets 13 sets of slicks, five of intermediates and two of full wets, and Sprint weekends cut the slicks to 12. In a dry race every driver must use at least two different slick compounds, so everyone has to stop at least once.

Sources: Formula1.com, Pirelli.

Blankets, pressures and temperatures

Tyre blankets survived the new rules, within strict limits. The FIA's tyre prescriptions for Singapore capped slicks and intermediates at 70C for a maximum of two hours, with full wets held to a lower temperature. The limits apply to the actual tread and sidewall temperature rather than the controller setting, and a tyre may only be heated before the session it will be used in.

Pressures are policed just as tightly. Pirelli sets a minimum starting pressure for every event and the FIA checks it, along with cold pressures, camber angles and time in the blankets. The numbers change from circuit to circuit. At Miami the slick minimum was 26.5psi front and rear, while at Singapore it was 24.0psi at the front and 23.0psi at the rear. As F1-Fansite's glossary puts it, the floor exists so that no team can gain performance by running below a safe pressure.

Graining, blistering and the undercut

Degradation is simply the drop-off in performance as a stint goes on. At Singapore, Pirelli expected it to come mainly from the rear tyres losing grip as drivers accelerated out of the slow corners.

Graining and blistering are the two tyre ailments you will hear about most, and they sit at opposite ends of the temperature scale. Graining happens when a tyre is too cold and slides, tearing its surface into thin ribbons of rubber that shrink the contact patch. Blistering starts inside the tread, where too much heat makes the rubber release gas and lift away in bubbles, and the grip falls off a cliff. The cures are opposite as well. A grained tyre needs to be worked harder to bring its temperature up, while a blistered one needs cooling.

Then there is the pit wall's favourite weapon. The undercut means pitting before the car in front, so that your quick out-lap on fresh tyres beats its slow in-lap on worn ones and you come out ahead once it stops. Sebastian Vettel did exactly that to Charles Leclerc and Lewis Hamilton in Singapore in 2019. The overcut is the reverse: you stay out longer, keep your pace up on old tyres, and hope your rival struggles to get new ones up to temperature.

What 2026 has actually done

Early on, the tyres were simply too tough. Australia and China were both won by Mercedes on a one-stop, according to Motorsport.com, with many front-runners doing the same. Several factors combined. The C6 had gone, the minimum weight was 32kg lower, downforce was much reduced and drivers were lifting and coasting to save battery. Pole in China was 1.423s slower than in 2025, and less load through the corners means less wear.

Pirelli had hoped for something different. "The target for the new tyres was similar to last year, so to have a mix of one-stop, two-stop with the three compounds suitable for the race," Mario Isola, then Pirelli's motorsport boss, said in March, though he insisted the early choices had not been far from ideal. He added that "cars that are running now are probably quite different from cars that are going to run in the second half of the season", and that selections could move, most probably towards the soft side.

Since then the soft end of the range has come alive. By Singapore, Pirelli was saying the C5 had shown at Budapest, Monza and Baku that it could hold strong pace with limited degradation, and that the latest cars make better use of the softer compounds. For the Americas it has gone softer, and Sao Paulo gets the softest trio, softer than its 2025 selection.

Singapore showed how fine the margins are. The grid split evenly between softs and mediums for an expected one-stopper. Max Verstappen started on softs, switched to mediums on lap 33 and held the lead throughout. Hamilton pitted early for fresh softs, rejoined seventh and tried to make them last. He was third with ten laps left, then faded to sixth and apologised over the radio, apparently taking the blame for not stopping again. Leclerc stopped twice and finished second. "We had pace when we needed to have it on the soft tyre and on the medium, even though I think the medium tyre for everyone was a bit more of a struggle," said Verstappen.

What to expect at COTA

For the United States Grand Prix on 23-25 October, Pirelli has picked the C2 as the hard, the C3 as the medium and the C4 as the soft. Last year it tried a bigger step and nominated the C1 as the hard, but teams largely ignored it and leaned on the two softer tyres rather than trying to save a stop. This year's hard is one step softer.

The Circuit of the Americas runs 56 laps of 5.513km with 20 corners. Pirelli says its many high-speed corners and quick changes of direction load the tyres more sideways than under braking and traction, so degradation tends to be thermal and depends on the air temperature, which Pirelli says can still be quite high in Texas in October. Singapore was the last Sprint weekend of the year, so Austin is a standard weekend with 13 sets of slicks. Will the softer selection give teams a genuine choice between one stop and two, with the medium doing most of the work, or will track position win out and leave us with another one-stop race?

Our scorecard

Our verdictPirelli had to build tyres for cars it could not test, and it aimed them at the end-of-season car. That made the opening rounds predictable, because rubber that barely wore meant races were settled by one stop and track position. Softer choices were always the answer, and Pirelli is finally making them. We would go further and take the softest safe trio to more circuits next year, so that a two-stop race becomes something teams plan for rather than stumble into. We give the 2026 tyres 6/10.

Sources: Formula1.com, The beginner's guide to F1 tyres, Singapore tyre selection and Singapore race report; Pirelli, the 2026 compound range, what's changing in 2026, Austin, Mexico City and Sao Paulo selections and 2025 Austin preview; FIA, Singapore tyre prescriptions and Miami tyre prescriptions; Motorsport.com, Pirelli on one-stop races and undercut and overcut explained; GPFans, pit stop strategy explained; GrandPrix247, Pirelli's Singapore preview; F1-Fansite, graining and blistering. Facts as reported up to 14 October 2026; opinions are ours. See all headlines on the wire