"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. U.S.A. Tire Type: Microcellular Polyurethane, Rim Size (in.): 4, Tire Size: 2.80/2.50-4, Bearings Included: Yes, Hub Width (in.): 3, Load Capacity (lbs.): 275, Rim Included: Yes, Grease Fittings: Yes, Tread Type: Sawtooth 1/2in bearings"
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