Article C3.18.13
Rear Wing Endplate Flexibility
Technical Regulations
Article C3.18.13
Rear Wing Endplate Flexibility
Chapter: C3
In Simple Terms
The rear wing endplates (the vertical pieces at the ends of the rear wing) can only bend a maximum of 10mm when the FIA pushes on them with a specific 50-Newton force during testing. This prevents teams from using overly flexible wings that could change shape during racing to gain an unfair advantage.
- Rear wing endplates must not flex more than 10mm under a standardized 50N inward force test
- The test uses a 15mm diameter spherical tip applied at a specific location on the endplate
- Measurement compares deflection between the two endplates on opposite sides of the wing
- Rigid-body rotation of the entire wing assembly is excluded from the deflection measurement to isolate actual endplate flexibility
Official FIA Text
Rear Wing Endplates may deflect no more than 10mm when 50N point load applied inward normal to car centre plane using spherical 15mm diameter tip at [XR, Z]=[675, 550]. Rigid-body rotation of whole wing assembly removed from measurement. Deflection measured relative to opposite RWEP.
rear wing endplateflexibility testdeflection limit10mm50N load
2026 Season Regulations