Cadillac used fake tyres in wind tunnel testing for F1 2026

Cadillac’s entry into Formula 1 in 2026 marks a significant moment for the championship, but the road to the grid hasn’t been without its challenges. The General Motors brand secured its place as the 11th team after formal approval in March 2025, a process that unfolded over a considerable period.

Preparing for a New Era

Cadillac’s arrival coincides with a period of substantial regulation changes in Formula 1. The upcoming rules are described as some of the most significant in the sport’s history, featuring a roughly 32kg reduction in chassis weight, decreased downforce and an increased emphasis on electrical power within the power unit.

Early Development Hurdles

While anticipation for Cadillac’s participation had been building for some time, preparations faced an unexpected obstacle: access to Pirelli tires for wind tunnel testing. According to Pat Symonds, the team’s engineering consultant, development work began before January 2025, but with some uncertainty regarding the final regulations.

Did You Know? Cadillac began preliminary development of its 2026 Formula 1 car before the regulations were finalized in January 2025.

“We didn’t actually have the Pirelli tyres to run in the wind tunnel, so we made our own tyres,” Symonds explained. Existing teams already had contracts providing access to Pirelli tires from January 1st. Cadillac didn’t receive theirs until later in the month, and upon arrival, the tires differed in shape from their initial estimations.

Re-Optimization and Progress

This discrepancy necessitated a re-evaluation of much of the team’s early work. Symonds acknowledged that while some believed Cadillac may have started development ahead of competitors, the late arrival of accurate tire data effectively put them behind. Despite this setback, the team has made substantial progress.

Expert Insight: The reliance on accurate tire data in Formula 1 wind tunnel testing highlights the intricate relationship between tire performance and aerodynamic development. A mismatch between predicted and actual tire characteristics can significantly impact a team’s design direction and require substantial re-optimization.

Unlike teams such as Williams and Aston Martin, Cadillac successfully completed a shakedown run in Barcelona for the first collective shakedown of 2026 cars, and followed that with testing in Bahrain. Team Principal Graeme Lowdon emphasized the rapid progress made in a short timeframe. “Less than 12 months ago, we didn’t even have an entry,” he stated in Bahrain.

Lowdon highlighted that the team met all its key milestones, including the initial engine firing in early December, virtual testing in mid-December, and on-schedule shakedowns in Silverstone and Barcelona. The team completed over 1,700 kilometers of testing in Bahrain, generating a significant amount of crucial data.

Looking Ahead

With the initial phases of testing completed, Cadillac’s focus now shifts to a deeper understanding of its car’s performance characteristics. Further testing and data analysis will be critical as the team prepares for the 2026 season. The team will continue to refine its aerodynamic package and power unit integration based on the data collected. Analysts expect that the team will focus on maximizing the potential of the new regulations.

Frequently Asked Questions

When was Cadillac’s Formula 1 entry formally approved?

Cadillac’s entry was formally approved in March 2025.

What major changes are coming to Formula 1 in 2026?

The chassis will be approximately 32kg lighter with less downforce, and the power unit will be more electrical.

What challenges did Cadillac face in its early preparations?

Cadillac did not initially have access to Pirelli tires for wind tunnel testing and had to create its own, which differed in shape from the actual Pirelli tires when they finally arrived.

Given the complexities of entering a new sport at the highest level, what will be the biggest challenge for Cadillac as they move closer to the 2026 season?