Selecting the correct caster for your application is very important. If you do not select the correct caster, you or the users of your equipment could be injured. If you are not absolutely sure which caster is the correct one for your use, contact a safety or engineering consultant who knows your equipment and its intended use to assist you. The first consideration of caster selection is to determine the combined weight of equipment and maximum load. Generally, the greater the combined weight, the larger the wheel must be.
Larger wheels distribute weight and roll more easily.
To determine the load capacity for each wheel, divide the combined weight of equipment and maximum load by the number of casters to be used. This is the weight that each caster and wheel must support. Even though Jarvis' load ratings include a safety factor, always select a caster and wheel that is rated for a capacity greater than the calculated load per caster. It is important to select casters with extra load capacity to allow for unusual circumstances. There may be other considerations which affect the size of the wheel you should select.