Steel casters are the main wheel used on large rolling hangar doors. The casters are made of solid steel and come in various sizes (6 in.-24 in. diameters). These hangar door wheels are usually big in diameter but thinner in width. The casters come with two lips that go all around the caster to make sure the caster stays on track.
(2.5-3 in. wide x 6, 9, 12, 15, 18, or 24 in. diameter)