Three things define the 2026 Formula 1 rules: the cars get smaller and lighter, the power unit leans far more on electrical power, and DRS goes, replaced by Active Aero that moves both front and rear wings. This guide pulls together the numbers and terms from McLaren's explainer, published today (16 January), and Formula1.com's own overview.
Chassis: a 200mm shorter wheelbase and 30kg less minimum weight
According to McLaren, the 2026 cars have a wheelbase 200mm shorter, a floor 100mm narrower and a minimum weight cut from 798kg to 768kg. Tyres keep 18-inch rims but are 25mm narrower at the front and 30mm narrower at the rear. The same article says overall drag falls by up to 40%, while floor downforce drops by 15-30%.
The article's summary table, however, lists the floor reduction as "150mm", which contradicts the 100mm in the body text. This piece uses the body figure. Formula1.com gives no dimensions and describes the cars only as "shorter, narrower, lighter and nimbler".
Aerodynamically, the small "eyebrow" winglets above the front wheels and the rear beam wing disappear, and both wings are simplified. Formula1.com says the long ground-effect tunnels give way to flatter floors with extended diffusers and bigger openings, meaning less downforce and a higher ride height requirement.
Power unit: no MGU-H, roughly three times the electrical output
The 1.6-litre V6 turbo stays. The MGU-H, the heat recovery system, is removed, and the MGU-K is beefed up to harvest and deploy about three times as much energy. Both sources describe a power split of roughly 50:50 between combustion and electrical. Formula1.com adds that the battery can recharge with twice as much energy per lap.
Fuel becomes 100% advanced sustainable fuel. McLaren notes F1 had been running a 10% bioethanol fuel, and that the new blends are slightly less calorific than their fossil predecessors. Formula1.com names carbon capture, municipal waste and non-food biomass as sources.
DRS is gone: Active Aero and Overtake Mode
McLaren writes that "DRS no longer exists". Instead, the rear wing opens on all straights to cut drag, irrespective of the race situation. The wing modes were known as X mode and Z mode but are now officially Straight Mode and Corner Mode. Formula1.com says the system is available to every driver on every lap.
Overtaking help is separate. A car within one second of the car ahead at the detection point (usually the final corner) gets Overtake Mode on the following lap. In normal running, electrical deployment begins to taper off at 290km/h; in Overtake Mode the maximum 350kW is available up to 337km/h, then tapers off up to 350km/h. The Boost button lets the driver deploy electrical energy manually; Formula1.com says it can be used in defence as well as attack, anywhere on the lap, provided there is charge in the battery.
Safety changes
The roll hoop is strengthened and the nose impact structure now separates in two stages. The two sources differ on the increase: McLaren says the load rises from 16g to 20g (25%), while Formula1.com says 23% more load. New lights will also show the ERS status.
Why it matters for fans: much of the vocabulary in this season's broadcasts is changing. Expect Straight and Corner Mode, Overtake Mode and Boost where you used to hear DRS.