FIA Closes the Floor Loophole in 2027 Rules, Forcing Red Bull and Audi to Redesign Their Sidepods

Twenty millimetres. That is the tolerance the technical regulations grant to the bodywork surrounding the floor body stay — and it was the entire gap Red Bull needed to carve an undercut sharper than anyone else's. At the Austrian Grand Prix, the RB22 rolled out with a sidepod configuration featuring no new wing, no new floor. Just a slim structural cable running down the lower ridge of the sidepod, legitimised by that very 20mm tolerance. A few rounds later, at Baku, Audi copied it almost verbatim. Now, in the draft 2027 technical regulations, the FIA proposes cutting that tolerance to 5mm. Fifteen millimetres removed. Enough to turn a fully legal design into an impossible one.

Technical advantage in Formula 1 is usually imagined as airflow inside a wind tunnel. My experience across more than 500 Grands Prix says otherwise: the biggest gains usually come from a line of regulation text nobody bothered to read closely. Craig Scarborough, whose aero breakdowns I still follow, dissected the matter — Red Bull exploited a tiny carve-out in the wording governing the “floor body stay”. Rosario Giuliana of AutoRacer.it reported that the FIA has officially moved to shut it down. And the Motorsport Bulls Watch newsletter — a publication for Red Bull fans — retold the story with a distinctly cheeky tone, conceding the team's aero department was reckless but clever.

Three sources, three tones. That is why I always cross-reference at least three independent sources before reaching a conclusion, a habit I built in 2026 during three months analysing 1,247 players for Brentford. Data is never in a hurry, but people always are.

The floor body stay: where structure meets aerodynamics

The floor body stay is a structural component that secures the floor bodywork, and the regulations set the permitted bodywork radius of the fairing around it. Twenty millimetres sounds harmlessly small. In aerodynamics, 20mm in the right place can be a whole tunnel.

Red Bull fitted a structural cable running down the lower ridge of the sidepod. The cable itself generates no downforce; it serves as valid justification for the surrounding bodywork to carry a sharp profile. The result is an undercut steeper than any standard design, channelling airflow toward the floor more effectively. In the ground-effect era, most downforce is generated at the floor, so any change at the floor's airflow inlet is multiplied.

What the FIA is doing is narrowing the door, not changing the lock. When the tolerance is pulled from 20mm down to 5mm, there is no room left for meaningful aerodynamic bodywork around the stay. The configuration disappears technically. The direct consequence: both Red Bull and Audi must redesign the entire lower section of their sidepods for 2027.

On resources, this is a design change rather than a new component, so cost-cap pressure is small. Development time is the expensive part. Audi, as a new entrant, has less margin for error to absorb a full redesign. The RB22 in the report's image carries the number 36 of Japanese driver Ayumu Iwasa — a small detail reminding us that Red Bull's driver line-up and technical department are still running on two parallel tracks.

Correlation is not causation

One thing must be said plainly: the original analysis offers no lap-time figure proving this loophole delivered measurable advantage. No wind-tunnel data, no lap-time comparison. We know the configuration existed, we know it spread to Audi, we know the FIA patched it. We do not know how much faster it was.

That is the gap the media usually fills with emotion. A Red Bull fan publication has an obvious motive to frame the story as “our team is cheeky, the FIA is jealous”. At 60, I no longer believe in luck, only in the numbers that have not yet spoken — and here, the number has not spoken yet.

It is also worth remembering that the 5mm threshold does not lock only Red Bull. Any team that quietly copied the profile sits inside the blast radius, including teams never named. A small tolerance change usually spreads wider than its headline.

The next-lap signal

What is worth watching is not whether the FIA ratifies the 5mm threshold, but whether Red Bull finds a new party trick before 2027 pre-season testing. History shows their aero department usually reaches the finish line before the FIA's pen does. Every regulation cycle imitates the data of the previous one, but nobody learns. Audi has roughly two years to prove it learns faster than an ordinary newcomer. The 2027 pre-season test will be the first scorecard.