F1 Glossary · cars
Ride Height
The vertical distance between the bottom of a Formula 1 car's floor and the track surface, critical for aerodynamic performance.
Understanding Ride Height
Ride height is the vertical distance between the lowest point of a Formula 1 car’s underbody—specifically the reference plane or "plank"—and the track surface. In modern F1, this measurement is one of the most critical setup variables because it directly dictates how much downforce the car generates through its floor.
Why It Matters During a Race
Since the introduction of ground-effect regulations in 2022, ride height has become the primary lever for performance. These cars use shaped tunnels under the floor to accelerate air, creating a low-pressure zone that pulls the car toward the track. Generally, the closer the floor is to the asphalt, the stronger this effect becomes. However, if the car is too low, the airflow can "stall," or the car may physically hit the ground (bottoming out), leading to instability or the violent bouncing known as porpoising.
Throughout a race, ride height is not static. As the car loses weight from burning fuel, the suspension rises. Teams must calculate a starting height that accounts for this change while ensuring the car remains legal by the end of the session. If the car is set too low for a bumpy track, it can become difficult to drive and risk mechanical damage.
Recent Examples and Regulations
The 2023 United States Grand Prix provided a high-profile example of ride height's impact. Lewis Hamilton and Charles Leclerc were disqualified after the race because the "plank" underneath their cars had worn down beyond the 1mm tolerance allowed by FIA regulations. The bumpy surface at Circuit of the Americas caused the cars to strike the ground more often than their teams had anticipated during the limited practice time of a Sprint weekend.
Common Viewer Confusion
Fans often confuse ride height with "rake." While ride height is the absolute distance from the ground at any given point, rake refers to the angle of the car from front to back. Historically, some teams favored a "high rake" setup (rear much higher than the front), but the current ground-effect era has pushed most teams toward a flatter, lower profile to maximize the efficiency of the underfloor tunnels.
Common questions
- Why do teams want the car as low as possible?
- Lowering the car increases the ground effect, creating a vacuum under the floor that pulls the car toward the track. This increases grip in high-speed corners. However, if the car is too low, the floor can touch the track, causing the car to lose grip instantly or damage the mandatory skid block.
- How is ride height measured?
- It is measured from the reference plane on the bottom of the chassis where a composite plank is attached. Sensors provide real-time data to engineers during the race, while the FIA checks the physical wear on the plank afterward to ensure it hasn't been worn down excessively by hitting the track.
- Does fuel load change ride height?
- Yes. At the start of a race, a car carrying 100kg of fuel sits significantly lower than it does at the end. Engineers must design the suspension to manage this weight transition so the car doesn't bottom out early or lose too much aerodynamic efficiency as it becomes lighter and the ride height increases.
- What causes the sparks seen under the car?
- Sparks are caused by titanium skid blocks, which are attached to the plank, striking the track surface. This usually happens at high speeds when aerodynamic load pushes the car down, or when the car hits a bump. While visually impressive, excessive sparking can indicate the ride height is too low.