Ductile Steel Wheel The heaviest wheels we manufacture are ductile steel wheels and are capable of taking very heavy weight capacities, high heat and extreme shock loads. Ductile steel wheels are comparable to forged steel wheels, but cost less. The design of these wheels are extra heavy-duty; with a thick walls throughout and an enlarged heavy-duty solid web core with an oversized hub, enables it to be machined, to be fitted for special bearings or a keyway. These wheels may be fitted with roller bearings for standard applications, or can be fitted with either Sealed Precision Ball bearings or Tapered Bearings Come with painted Red finish. Durometer: 98 Shore D. Temperature Range: -45 to +800 Degrees / F.