What the technical regulations say:
- Formula 1 cars must have conventional sprung suspension.
- Interconnected suspension systems are not allowed. As such, suspension fitted to the front wheels must be so arranged that its response results only from changes in load applied to the front wheels, and likewise for the rear wheels.
- Any system, such as active suspension, that can alter the suspension or its geometry while the car is moving is forbidden.
- Suspension members must have a symmetrical profile for the majority of their length.
- There may be no more than six suspension members connecting each suspension upright to the fully sprung part of the car.
- Non-structural parts of suspension members are considered bodywork.
- Each wheel must be tied to the body of the car by three tethers. No more than two tethers may be contained within a single suspension member and each tether must have its own attachment at either end. The tethers must meet specific tensile strength requirements and are designed to stop the wheels coming loose from the car in the event of an accident or suspension failure.
- The tethers and their attachments must also be designed in order to help prevent a wheel making contact with the driver's head during an accident.
- Power steering systems are allowed, but these must not be electronically controlled or powered. Four-wheel steering is forbidden. The car’s steering wheel, steering column and steering rack all have to pass an FIA impact test.