Article C4.4
Adding Mass During Race or Sprint Session
Technical Regulations
Article C4.4
Adding Mass During Race or Sprint Session
Chapter: C4
In Simple Terms
During a race or sprint, teams cannot add any substances to the car to make it heavier, except for gases used in safety systems. If they need to replace a broken part, the new part must weigh the same or less than the original part.
- No substances can be added to the car during race or sprint sessions
- Compressed gases (like those in safety systems) are the only exception
- Replacement parts must not exceed the mass of the original part
- This rule prevents teams from gaining unfair advantages through weight adjustments mid-race
Official FIA Text
With exception of compressed gases, no substance may be added to car during Race or Sprint Session. If necessary to replace any car part during Race or Sprint Session, mass of new part must not be more than original part.
mass additionrace rulescar weightpart replacementcompressed gases
2026 Season Regulations