Wheels are heavy duty, polyurethane, Ø4” x 1 1/4″ wide with two sealed roller ball bearings per wheel.  Support wheels are on a maximum of 8” centers.

Wheel fastening shoulder bolts are Ø5/8” with 1/2-13 threads.  (Some competing units use smaller than Ø2” x 9/16” wide wheels with 7/16” hardware.)