Article C4.2
Mass Distribution
Technical Regulations
Article C4.2
Mass Distribution
Chapter: C4
In Simple Terms
During qualifying sessions, F1 cars must distribute their weight properly between front and rear axles. The front axle needs at least 44% of the car's minimum weight, while the rear axle needs at least 54%. If a team declares a heat hazard, any extra weight added for cooling isn't counted toward these minimums.
- Front axle must have minimum 44% of the car's minimum weight during qualifying
- Rear axle must have minimum 54% of the car's minimum weight during qualifying
- Weight distribution is checked when the car is on a level surface
- Extra weight added due to heat hazard declarations is excluded from these calculations
Official FIA Text
During Qualifying and Sprint Qualifying Sessions with car on horizontal plane: front axle mass must not be less than Minimum Mass factored by 0.44; rear axle mass must not be less than Minimum Mass factored by 0.54. If Heat Hazard declared, increase in mass not considered.
mass distributionweight distributionfront axlerear axlequalifying session
2026 Season Regulations