A tire assembly for a road vehicle is provided. The assembly includes a tire and first and second expandable chambers positioned within the tire. A series of actuators for selectively pumping air to the first and second chambers is provided, wherein the assembly includes a third chamber arranged between the first and second chambers. Each of the actuators is pneumatically connected to the first, second and third chambers by way of a radial air loop, wherein the radial air loop has a first chamber valve, a second chamber valve, an actuator valve, and a third chamber valve.