Article C3.18.8
Floor Board Flexibility
Technical Regulations
Article C3.18.8
Floor Board Flexibility
Chapter: C3
In Simple Terms
The floor of an F1 car must be rigid and stable. When tested with weights pushing down on it, the floor can only bend a maximum of 5mm in the middle section, and no more than 7mm around the edges. This ensures all cars have similar, predictable aerodynamic performance and safety.
- Floor can deflect maximum 5mm when 100N load applied at the center measurement point
- Floor can deflect maximum 7mm when 60N lateral loads applied at any edge point
- Testing uses standardized 25mm diameter adapters to ensure consistent and fair measurement across all teams
- Flexible floors would create unpredictable aerodynamic advantages, so this rule keeps competition fair
Official FIA Text
Floor bodywork may deflect no more than 5mm when 100N vertical load applied at [XF, Y]=[695, ±720]. Also must deflect no more than 7mm when load of [0, ±60, 0]N applied at any periphery point. Loads applied using weights through 25mm diameter adapters with 2.3mm rods through holes.
floor flexibilityfloor stiffnessdeflection limitsbodywork rigidityaerodynamic stability
2026 Season Regulations