"Contractor-grade solid microcellular polyurethane tire performs like an air tire, yet never goes flat! Lightweight and durable. Mounted on a heavy-duty steel rim with ball bearings and grease fitting. Tire Type: Microcellular Polyurethane, Rim Size (in.): 4, Tire Size: 4.10/3.50-4, Bore Diameter (in.): 5/8, Bearings Included: Yes, Hub Width (in.): 2 1/4, Load Capacity (lbs.): 300, Rim Included: Yes, Grease Fittings: Yes, Tread Type: Sawtooth 5/8in bearings"
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