What will be the winning factor in the next Formula 1 season? Will it be the new power unit, the active aerodynamics, or the weight reduction? With the increase of 34 kg in engine weight and a decrease of 30 kg in the minimum car weight, engineers face the formidable challenge of cutting around 60 kg from the chassis. Will they succeed, or will we see overweight cars, at least in the first year under the new regulations?
The main characteristic that will define the agility of the 2026 F1 cars is still widely debated. Some experts believe the new power unit, with a 50/50 split of power between the hybrid system and the internal combustion engine, will be decisive. Others argue that aerodynamics, even though more restricted than today, could still provide designers opportunities to find performance solutions that the legislators did not anticipate. There is also a third critical factor: weight. This element, combined with the power unit and aerodynamics, could have a significant impact on overall car performance.
The FIA’s intention has been to reverse a long-standing trend of increasing minimum weight. Over the years, the introduction of ERS systems with MGU-K and MGU-H motors, batteries, and safety devices like the Halo, reinforced side panels in Zylon, and wheel retention systems, has steadily increased car mass. Today, modern F1 cars weigh approximately 800 kg with the driver on board, excluding fuel, compared to just over 500 kg in the 1970s. With shorter wheelbases of 3,400 mm (200 mm less than today) and narrower widths of 1,900 mm instead of 2,000 mm, the FIA has set a new minimum target weight of 770 kg, requiring teams to shed 30 kg from the current cars.
Power unit, aerodynamics, or weight? Determining which factor will dominate is complicated because weight influences both the engine and aerodynamics. The new 2026 power unit alone will weigh a minimum of 185 kg, 34 kg heavier than the 2025 units. To reach the targeted 770 kg, engineers must trim approximately 60 kg from the rest of the car. Considering that tires alone weigh about 46 kg (with Pirelli tire tests still ongoing), achieving the target weight of 724 kg for the chassis will be a significant challenge.
Looking back, when ground-effect cars debuted in 2022, only Sauber reported being at the weight limit, while other teams exceeded it. The Red Bull RB18, which won the championship with Max Verstappen, was about 30 kg over the minimum, gradually reducing year after year until the current RB21 now requires ballast to meet weight regulations. In Formula 1, every 10 kg can cost around 0.3 seconds per lap, highlighting how crucial weight management will be under the 2026 rules. Overweight cars at the start of the season are therefore a realistic possibility.
The design approach will be essential: every decision will have direct implications for performance. Ferrari, for instance, has reportedly experimented with miniaturized battery packs to reduce weight and size, although this could limit electrical energy efficiency in critical situations. Will the Scuderia prioritize lightweight components over energy efficiency, or have priorities shifted after bench testing of the power unit?
It is clear that teams will adopt very different design philosophies in 2026. Only after a season of racing will engineers and designers converge on the solutions that define the optimal car setup under the new regulations. The prospects are exciting, but the many unknowns leave ample room for technical creativity and strategic experimentation.
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