Little or minimum effort can be possible on your operator by installing VXB20060CPU3B just ask your operator to push and pull, but not carry. Wheel dia. is 60mm or 2.362" inch in inches. The wheel has a width of 60mm=2.362" inch. The caster dimensions heightwise is 48mm/1.890" inch. Mounted via a Top Plate that has a size of 38mm x 38mm and the holes distance of 129mm x 74mm. The Roller bearing design will enable the Nylon and Polyvinyl Chloride tire to roll easily with a core made of Nylon and Polyvinyl Chloride. Maximum load calpacity that could not be exceeded on each wheel, remember to add safety factor, when calculating the load capacity 77 lb with a Swivel type. The Temperature range is -40 to 180 F. FYI, you will need to buy the VXB20060CPU3B in order to get one :).