Type: WALKER CASTER WHEEL. WALKUP005 – USED Gray 7.5″ Caster Wheel for Wheelchair or Walker. WALKP0002 – NEW Invacare 8 x 1in 8-Spoke Grey Caster Wheel RP265001 Solid Tire. 2-1/4″ hub, solid tire. WALKP0005 – USED Gray 8″ x 1.25″ Gray 5-spoke 2″ hub with Bearing.