An in-tyre sound absorber (1) for a pneumatic wheel assembly including a wheel rim (9) and a tyre fitted to the wheel rim.

In order to do so, consider going with a pneumatic wheel.

There is also provided a use of an adsorptive material (70) for the purpose of lowering the spring rate of an air spring (1), including a gas strut and a pneumatic wheel.

An hydraulic motor driven wheel axle is mounted on the lower end of each control arm with at least one pneumatic wheel mounted upon each axle.

The propulsion system could be a simple electric motor located inside a pneumatic wheel or an advanced maglev system.