- The cars must have sprung suspension.
- No powered devices, such as active suspension, may be used to control suspension movement.
- Up to 6 suspension members may be used to connect the suspension upright to the car.
- Tethers must be fitted to wheels in order to prevent them from becoming detached from the car and also to prevent them from coming into contact with the driver’s head.
- Only two wheels may steer.
- Power steering is permitted however it cannot be electronically controlled.