Abstract: A ski attachment for a free-turning vehicle wheel consisting of one or more skis, rigidly joined if more than one, adapted to be placed beneath the wheel in line therewith, a cradle carried on the top of the ski, to the rear of center thereof, and configurated to receive and support the lower portion of the tire of the wheel, and tension devices for drawing the cradle into indenting relation to the tire. The tension devices may consist of connectors joining the cradle to the wheel axle at each side of the wheel, or of steel straps surrounding tire peripherally and joined at their ends to the cradle. A special ski bottom configuration assists in preventing lateral slipping or skidding in turns.

Abstract: A snow traction device for motorcycles or other vehicles consisting of a frame adapted to be supported from the axle of a power driven vehicle wheel, an endless flexible belt mounted about rollers carried by the frame and moving in an elongated loop extending forwardly and rearwardly beneath the wheel so that its lower reach may engage the snow, and a pair of rollers carried rotatably by the frame and snugly engaging both the vehicle wheel and the upper reach of the belt, whereby the former drives the latter to propel the vehicle. The frame mounting is adjustable to adapt it to fit operably relative to vehicle wheels of different diameters, and the froward end portion of the lower belt reach is angled upwardly to better attack the snow. A pair of skis are disposed respectively at opposite sides of the frame, parallel to the line of vehicle travel, and are urged resiliently downwardly relative to the frame.