Cadillac's Road to F1: How Substitute Tyres Shaped Wind Tunnel Development Strategy
Cadillac's preparation for its 2026 Formula 1 debut encountered challenges during aerodynamic testing, prompting the team to employ alternative solutions. The General Motors-backed outfit, officially approved as the championship's 11th team in March 2025, has navigated several hurdles on its path to grid entry.
As Cadillac gears up for its maiden Formula 1 campaign in 2026, the journey to get race-ready has not been entirely smooth sailing. The General Motors brand's entry into the sport was formally sanctioned in March 2025, marking the conclusion of a lengthy approval process that had stretched on for some time.
The team's preparation phase, which has coincided with the introduction of F1's new regulatory framework, has presented its own set of complications. During crucial wind tunnel testing sessions, Cadillac encountered obstacles that necessitated an unconventional approach to development work. Rather than utilizing the official Pirelli rubber mandated for such testing, the team opted to employ replica tyres as substitutes during their aerodynamic evaluations.
This workaround in the testing program reflects the various logistical and technical challenges that teams must overcome during their establishment phase. With Cadillac now taking its place as the 11th competitor on the grid, the team continues to refine its competitive package ahead of the 2026 season launch.
Original source
Motorsport.com
Related Regulations
Hover over badges for quick summaries, or scroll down for full official text and simplified explanations.
Full Regulation Text
Article 9.1
Tyre Specifications
Chapter: Chapter IX - Tyres
In Simple Terms
Pirelli is F1's sole tyre supplier. Each driver gets a fixed allocation per weekend: typically 13 sets of slicks (across soft, medium, hard), plus wet weather tyres. Teams must strategically use their allocation across practice, qualifying, and the race.
- Pirelli is sole official supplier
- Fixed allocation per weekend
- Three dry compounds: soft, medium, hard
- Intermediate and wet also provided
Official FIA Text
Only tyres supplied by the official tyre supplier may be used. During a race weekend, each driver is allocated a specified number of dry weather tyre sets comprising soft, medium and hard compounds, plus intermediate and wet weather tyres.
Article B11.6.3
PE - Tyre Requirements
Chapter: B11.6
In Simple Terms
F1 teams can only use tyres that are specially made by the official tyre supplier for Formula 1. You can't use tyres from anywhere else or modify standard road tyres - they must be purpose-built racing tyres.
- Only the official F1 tyre supplier can manufacture tyres for use in the championship
- Teams cannot use aftermarket, modified, or standard road tyres
- All tyres must be specifically designed and produced for Formula 1 racing
- This ensures fairness and safety across all teams
Official FIA Text
Only tyres manufactured specifically for this purpose by the Tyre Supplier may be used.
Article C10.8.1
Tyre Supply
Chapter: C10
In Simple Terms
Teams must use Pirelli tyres exactly as they come from the factory without any modifications like cutting, grooving, or chemical treatments. The FIA can approve different tyre specifications only if the standard tyres aren't suitable for specific race conditions.
- Tyres must be used in their original, unmodified state as supplied by the manufacturer
- Any modifications including cutting, grooving, or application of solvents are strictly prohibited
- The FIA has authority to authorize alternative tyre specifications only when standard tyres are deemed unsuitable for racing conditions
Official FIA Text
All tyres must be used as supplied by manufacturer. Any modification including cutting, grooving, or application of solvents is prohibited. FIA may authorize additional tyre specifications if unsuitable.
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