The anti-skid vehicle tire includes studs mounted in the tread wall and movable between extended road engaging and retracted non-road engaging positions, high and low pressure chambers within the tire wherein the low pressure chamber maintains the tire in inflated condition, pressure responsive expansible means coacting with the studs to control stud position, and valve means for selectively intercommunicating the expansible means with the high pressure air chamber and atmosphere to retract and extend the studs.