In an effort to improve the flotation and mobility of off-road vehicles on the low strength soils which underlie large portions of the forest area throughout Canada, FERIC initiated a search for a dependable high-flotation tire which could be used to improve the performance of existing logging machines. This report describes the four-year testing and development program, and the performance of skidders equipped with wide, high flotation tires on both soft and on steep terrain. The advantages and disadvantages of these tires are summarized.