Article C9.6.3

Forward Gear Ratio Pair Specifications

Technical Regulations

Article C9.6.3

FIA Source

Forward Gear Ratio Pair Specifications

Chapter: C9

In Simple Terms

F1 gearbox gear pairs must meet minimum physical specifications to ensure durability and safety. Each gear pair needs to be at least 12mm wide at its root, weigh at least 600g (not counting the shaft), and have smoothed edges with specific angle and radius limits.

  • Minimum gear width of 12mm at root diameter to prevent structural failure
  • Minimum mass of 600g per gear pair (excluding shaft/collar) for strength and durability
  • Chamfer edges limited to maximum 10 degrees with radius not exceeding 2.0mm for safety and precision
Official FIA Text

No forward gear ratio pair may be less than 12mm wide at root diameter or less than 600g in mass excluding integral shaft or collar. Chamfer maximum 10 degrees with radius not exceeding 2.0mm.

gear ratiogearbox specificationsgear pairroot diametergear mass
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