the only 'down side' consideration to the 'solid-pneumatic' style tire comes in if your operation does a lot of tight turns where the inside drive tire may twist in the turn. this can build up heat in the side-wall area of a 'solid-pneumatic'. side-shifter equipped forklift will experience less of this turning and twisting, and the quality/cost of the tire makes a huge difference in this concern, too, with better tires being less susceptible to the heat-buildup caused damage. (usually though, a properly specified truck/operation would have a cushion tire unit with a side shifter if your operation required careful placement of a load, and would use the pneumatic unit where space was less of a concern)