Diameter 5.5" (139.7mm) Tire Width 1.75" (44.4mm) Rugged treaded wheel is narrower in width to fit inside wheel pants and retracts easier. Comes drilled for 3/16" (5mm) axle diameter and can be drilled out to 1/4" (6mm) if desired. Package contains one wheel complete with positive seal air valves and inflator adapter.