Glossary
What is Ride Height? How to Measure It and Why It Matters
Ride height is the distance from the ground to a fixed reference point on the chassis, usually the floor or a jacking point, measured at each corner with the driver and fuel load on board. It sets the centre of gravity height, the roll centre positions and, on an aero car, the amount of downforce the floor produces. Front and rear ride heights are usually set independently and the difference between them is called rake.
| Car type | Front | Rear | Limiting factor |
|---|---|---|---|
| Formula / sports prototype | 15–30 mm | 40–70 mm | Plank or skid-block wear, porpoising |
| GT3 | 55–70 mm | 70–90 mm | Series minimum ride height rules |
| Touring / production | 90–130 mm | 100–140 mm | Suspension travel and bump steer |
| Speedway sedan | 100–150 mm | 100–180 mm | Track roughness; left side often lower than right |
How to measure ride height repeatably
Use a flat, level setup pad with the tyres at race pressure. Roll the car back and forth or bounce each corner to settle the suspension on its dampers and tyres before measuring. Measure from the ground to the same chassis points every time, with the driver (or equivalent ballast) seated and the fuel load you will race with.
Because ride height depends on spring preload, corner weights and tyre pressure, change it last and re-check corner weights afterwards.
What ride height changes
Lowering the car lowers the centre of gravity, which reduces load transfer and generally increases grip. It also lowers the roll centres, usually by more than the centre of gravity moves, which increases the roll moment and can make the car roll more despite being lower. On a car with a flat floor or diffuser, ride height and rake control how much downforce the underbody produces and where the aero balance sits.
Frequently asked questions
Should ride height be measured with the driver in the car?
Yes. A 75 kg driver can lower one side of a light car by several millimetres. Use the driver or equivalent ballast in the seat for every measurement.
Why does my ride height change after a session?
Tyres grow with heat and pressure, dampers warm up, and springs can settle. Measure cold with tyres at your reference pressure for consistent comparisons.
What is the difference between ride height and ground clearance?
Ground clearance is the lowest point of the car to the ground. Ride height is a setup reference measured at specific chassis points, which is more useful for comparing setups.
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