Abstract: A pressure adjustment device for adjusting air pressure within a tire of a vehicle is disclosed. The device includes a housing formed of a cap and a base and including a piston, a spring and an air valve, wherein the cap includes an air inlet and the base includes an air outlet that is in fluid communication with the neck, wherein the piston moves proximally to compress the spring in response to a presence of a centrifugal force due to the vehicle traveling at least at a predetermined speed, where the proximal movement of the piston activates the air valve thereby enabling fluid to flow into the housing, and where the spring is configured to decompress when the centrifugal force decreases thereby deactivating the air valve and compressing the fluid within the housing distally out the air outlet toward the tire.