Article C3.5.4
Main Floor
Technical Regulations
Article C3.5.4
Main Floor
Chapter: C3
In Simple Terms
The main floor is created by combining three floor parts (the body, foot, and sidewall) into one solid piece. It can have rounded corners up to 30mm and must completely hide the sidewall from the side view. Think of it as the car's flat bottom that helps with aerodynamics.
- Made from three combined components: Floor Body, Floor Foot, and Floor Sidewall
- Maximum fillet radius (rounded corners) of 30mm allowed
- Must form a single connected volume with no separate pieces
- Must fully obscure the sidewall when viewed from the side
Official FIA Text
Main Floor results from Trim and Combination of Floor Body, Floor Foot, and Floor Sidewall. Fillet Radius no greater than 30mm may be applied. Must be single simply connected volume, visible from above or below, and fully obscure RS-FLOOR-SIDEWALL when viewed from side.
main floorfloor bodyfloor footfloor sidewallfillet radius
2026 Season Regulations