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Front caster wheel assembly replaces Scag 48307, 4800601. 9x3.50-4, 4-ply smooth/slick tire and tube, 4" centered hub, 3-piece rim with 5/8" open cage roller bearing(included) and zerk fitting, painted Scag gold. May use our WB5812 bearing with retainers, WB8318 bearing kit with spanner or WB7780 semi-sealed bearing kit, as replacements. Always match OEM part numbers from your manual to know you are ordering correct parts for your equipment.