Abstract: An anti-skid device. The device is installed between tire pairs in vehicles using dual tires in wheel assemblies. The device increases friction between the wheeled vehicle and a slippery surface therebelow. Each of the two or more dual tire type wheel assemblies has a wheel having a central axis of rotation, a first tire, and a second tire. The first and second tire are mounted to the wheel in a spaced apart relationship along the axis of rotation, to provide therebetween a centrally located mounting space which is located radially outward from the central axis of rotation. The anti-skid device is placed in the mounting space between the first tire and the second tire. The anti-skid device includes, in radially outward order, a retainer ring, a spacer ring, an inflation ring (preferably pneumaticaly inflatable), and an anti-skid tread ring. The anti-skid tread ring is displaceable outward by inflation of the inflation ring, so as to engage the slippery surface with tread lugs or studs.