The 2026 regulatory overhaul is being described by many as the biggest technical revolution in the last thirty years. The changes touch every area of the car, including Pirelli tires, which will differ from previous years in size, compounds, and structure. Rim freedom is also returning, giving teams new opportunities to better manage tire temperatures — a task that could be even more challenging with the new cars.
Smaller wheels
The initial proposal for the new technical cycle was to switch to 16-inch rims, which would have further reduced car weight — a key priority for the 2026 regulations. However, after evaluations, it was decided to stick with 18-inch rims, albeit with some modifications. The 2026 tires are slightly narrower than before, specifically 25 mm narrower at the front and 30 mm at the rear, with a reduction of around 10 mm in overall diameter. These changes help improve efficiency and reduce weight, with a single front tire weighing 10.4 kg and a rear tire 12.8 kg, for a total of 46.4 kg per set of slicks.
The new Pirelli range requires teams to learn and study all aspects of the tires. The size changes mean that the tire sidewall deforms differently when the car is in motion, with aerodynamic implications. Teams must therefore prioritize wind tunnel testing to understand how the vortices generated near the tire’s contact patch affect floor performance. Thermally, the smaller tires tend to operate at higher temperatures, although feedback from teams has been mixed.
Rims for temperature management
During the development of the 2026 product, Pirelli received feedback from some teams indicating that in certain conditions, heating the front tires sufficiently could be challenging. On one hand, the drastic reduction of aerodynamic downforce on straights — thanks to active aerodynamics, three times more effective than the old DRS — reduces tire compression on the ground, generating less internal heat. Higher straight-line speeds also increase cooling, aided by the smaller tire dimensions. Concerns are especially high on circuits with long straights, where front tires could arrive under temperature at braking zones. At Las Vegas and Baku, for instance, the old Pirellis would cool by more than 40°C on the front tires along the straight — a figure that could be even higher in 2026.
Managing tire temperatures will be crucial, as it always has been in Formula 1. However, beyond preventing overheating and thermal degradation, teams must ensure the tires do not drop below the optimal operating window. One important tool at their disposal is the rim, which unlike in the ground-effect regulation cycle, is no longer subject to a standard supply. Teams can now design rims to use brake heat to warm tires or optimize internal airflow for cooling. This returns an important area of technical innovation, reminiscent of the attention Mercedes’ perforated hubs received in 2019.
Returning to five compounds
For 2026, Pirelli has also rethought the tire compounds. Initially, six compounds were developed, but only five were homologated due to the small performance gap between C5 and C6. As Pirelli Motorsport director Mario Isola explained last August, the main challenge was predicting whether a compound would be too durable or prone to excessive degradation for the new cars: “When you have such a large regulatory change, the risk is to go either too hard or too soft, overestimating or underestimating the information you received. That’s why we wanted to work on six compounds ourselves — so we could later homologate five, spacing them as much as possible. This way, if we realized we were off on one side or the other, we could adjust the selection for each race.”
Pirelli also worked on widening the operating window, whose effectiveness will vary according to each car’s characteristics. The proposal to eliminate tire blankets for slicks was not approved, remaining banned only for wet tires. The company also aimed to shift the crossover point between full wets and intermediates to make extreme wet tires usable before conditions worsened critically. Pirelli developed a stiffer wet tire so that, even if active aerodynamics are disabled for safety, the increased downforce would not overly compress the car and wear the plank excessively.
New tire construction
Along with size and compounds, a further novelty is the tire structure — another change affecting deformation and aerodynamic impact. “As always, we worked to find constructions that are light but strong, maintaining pressures similar to current levels,” Mario Isola explained. “With smaller tires, you need higher pressures to support the same load. We explored innovative materials and concepts to keep pressures similar, despite reduced tire dimensions and loads that are not dramatically different from today.”
Overall, developing the 2026 tire has not been easy for Pirelli, which adjusted objectives and specifications as load estimates from teams were received, and teams in turn adapted based on grip predictions. There is great curiosity to see which concept will best manage the new tires, another variable in a full-scale regulatory revolution. Formula 1 in 2026 will be discovered progressively, where rapid learning will reshape the competitive order, with mid-season standings unlikely to match those of the first race.
As the 2026 season approaches, it is clear that the battle for supremacy will be won as much by the engineers analyzing rubber as by those designing wings. The return of custom wheel rims and the introduction of narrower, more sensitive tires present a fascinating technical challenge that could catch even the top teams off guard. In a sport where thousandths of a second matter, mastering Pirelli’s latest evolution will be the ultimate key to unlocking performance in F1’s bold new era.
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