The ultimate day of testing has begun, and Max Verstappen’s staff has launched the primary upgrades to the RB21. The method of understanding the “new” automobile remains to be ongoing, particularly relating to the invisible parts which have been modified. Among the many first adjustments noticed on the RB21 throughout testing is a brand new entrance wing—an replace, however with clear Ferrari influences.
The Crimson Bull RB21 has shocked everybody with its similarities to the RB20, making the 2025 automobile extraordinarily much like its predecessor. In keeping with Christian Horner, the automobile of the reigning world champion has been modified in particulars and in areas that aren’t instantly seen.
Among the many notable adjustments are a brand new association of the rear suspension arms and a revised sidepod geometry, now extra sculpted to reinforce undercut aerodynamics. Further modifications have been made to the higher engine cowl, geared toward enhancing airflow stress retention alongside the automobile.
Yesterday, Helmut Marko hinted at an preliminary RB21 replace, initially deliberate for Australia. With the primary pictures rising on the morning of the ultimate day of testing, Max Verstappen’s RB21 debuted a brand new nostril cone, accompanied by a redesigned flap geometry.
The brand new specification options parts impressed by Ferrari and Alpine, with a modified nostril that adjustments the flap attachment and, most notably, its total width. In comparison with the model utilized by Liam Lawson on Day 2, the brand new nostril is a number of centimeters wider. This transformation considerably impacts how airflow is directed alongside the perimeters of the nostril, following a design philosophy seen on Ferrari and Alpine in 2024. The large nostril idea has been retained in 2025 to allow a extra exact and efficient administration of airflow across the suspension and towards the sidepods.
Among the many different modifications within the new entrance wing is an up to date mainplane, which contains a new geometry within the central part. The “spoon” form within the center is now extra squared and pronounced to channel a better quantity of air. The goal of those modifications is to extend airflow directed beneath the nostril.
Adjustments have additionally been made to the “elbow” space, the place the flap and endplate join. Crimson Bull has now launched “curls” on the junction of the final two flaps, adopting an idea beforehand highlighted by McLaren and Ferrari. These curls are designed to reinforce the outwash impact, serving to to scrub up the airflow across the entrance wheels. Moreover, the chord size of the flaps has been completely revised, extending them to optimize incident airflow and generate better front-end downforce.
This modification is essential to the general efficiency of those automobiles, because the directed airflow feeds the ground, the first supply of aerodynamic efficiency. By enhancing front-end downforce, Crimson Bull goals to offer Verstappen and Lawson with a fair sharper entrance finish, aligning with the driving preferences of the Anglo-Austrian staff’s drivers.
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