Tesla Patent Shows Roadster Wing With 700 kg of Downforce

Tesla published a patent application Sept. 24 describing a two-piece active rear wing that produces up to 700 kg of downforce, built into a car that resembles the redesigned Roadster Tesla is set to show Oct. 1 in Texas.

Electrek reported the filing, U.S. patent application 2026/0285418 A1, titled "Deployable and Active Rear Wing Assembly with Safety Features," naming inventors David Lemire and James Michael Arthur Crook. The application published as a continuation of a filing made in March 2025, with the continuation filed in August 2025.

What the filing describes

The wing has two parts, a main element and a smaller leading-edge slat positioned 3 to 15 millimeters ahead of it, deployed through a four-bar linkage the filing says could also be built with linear rails or lead screws. In "road mode" the wing sits flush with the deck lid; deploying it fully takes under three seconds, and adjusting its angle takes under a quarter of a second, drawing on inputs the filing lists as speed, acceleration, steering angle, brake input, GPS location and autonomous-driving sensor data.

At speeds above 100 mph in the highest setting, the wing produces up to 700 kg of downforce, or roughly 1,540 pounds, Carbuzz reported after reading the same filing; a lower, standard deployed position produces about 1,100 pounds. Rotating the wing flat into a drag-reduction position cuts 250 drag counts, equal to 0.025 of a point on the car's drag coefficient, and brings downforce to zero.

Car	Downforce (patent or vendor claim)
Tesla Roadster patent, track mode	~1,540 lb (700 kg)
Chevrolet Corvette ZR1X	1,200 lb

That 1,540-pound figure would put the Roadster's patented setup ahead of the ZR1X and, Carbuzz said, ahead of the McLaren W1's own track-mode output, though McLaren has not published a comparable number Carbuzz could cite directly. For scale on the low end, BYD's newly dated Great Han launch is a reminder that most production EVs, including fast ones, are not engineered around downforce numbers like these at all; a wing this size is a track-day feature, not a range or efficiency one.

A wing that retracts before it can hurt someone

The filing includes a safety mechanism absent from most aftermarket or track-only wings: mechanical latches that release the wing if it strikes a pedestrian, cyclist or motorcyclist, and a predictive system using cameras, radar and lidar that retracts the wing automatically when the car's sensors detect an unavoidable collision, to keep the panel from adding a protruding edge in an impact.

Electrek's report notes the same design also includes a second element visible in the patent drawings, a tall rear diffuser, and points to a related 2025 Tesla filing for an underbody fan system, suggesting the aerodynamics on the production car, if the design ships, would combine more than one active system rather than the wing alone.

Still a patent, not a spec sheet

Carbuzz's own framing is the caveat that matters most: "Patent filings do not guarantee the use of such technology in future vehicles." Tesla has filed patents before for features that never reached a production car, and nothing in the application names the Roadster directly. The strongest evidence tying the two together is timing and appearance: the filing published a week before Tesla's scheduled Oct. 1 Roadster event in Texas, and the car drawn in the patent's own figures matches the redesigned Roadster's silhouette rather than any current Tesla model.

Tesla has separately delayed a vote at the EU on its Full Self-Driving system to December, so the company has more than one regulatory and product deadline converging in the same stretch of the calendar. Whether the wing in this filing is real hardware or a shelved concept will not be resolved by more patent analysis; it will be resolved by what Tesla actually drives onto the stage on Oct. 1.