The 8"x1-1/4" front caster wheel for the Invacare Tracer EX2 and SX5 manual wheelchairs is a composite moulding made of solid dark gray rubber. The caster is complete with bearings.
The flanged bearing has an inner diameter of 7/16" and an outer diameter of 1-3/64" or 26.6mm. The overall width of the hub, from outside edge to outside edge, is about 2.33" or 59.2mm.