Tire Types Cushion Tires are solid tires generally with no tread pattern (though tread patterns are available) designed for use indoors on smooth solid surfaces. Pneumatic tires require air and are designed for use outdoors on uneven and loose surfaces. Pneumatic tire trucks will also have higher ground clearance which raises the center of gravity thus reducing its rated lift capacity. Copyright 2011 Lift North America Call Toll Free - 1 888 305-3331