WHY MERCEDES HAS CHANGED ITS F1 CAR AFTER FIA/FERRARI INTERVENTION

Mercedes arrived at the Austrian Grand Prix with a revised diffuser design, forced to change its car after a new FIA ruling effectively banned an aerodynamic trick. For the last three races, Mercedes, Racing Bulls, and Haas had utilized serrated wedges on the diffuser’s trailing edge. This clever design extended the diffuser's effective length, providing a marginal but important boost in downforce and improved airflow to the rear wing.

Title rival Ferrari was especially agitated by the concept, having had a similar idea rejected by the FIA for 2026. Ferrari’s complaints, joined by Red Bull, escalated, with warnings that if unchecked, such designs could spiral into dangerous extremes, potentially causing punctures. The FIA responded swiftly, updating a technical directive after the Barcelona GP to immediately outlaw the loophole, which exploited floor stay allowances and edge radii rules. Mercedes and Racing Bulls adjusted their diffusers, while Haas's less extreme interpretation avoided a forced redesign. This quick intervention prevents an immediate tech war, ensuring stability for teams heading into the latter half of the season.