Du-Bro Large Scale Treaded Inflatable Wheel 4" Part No: 400TV. Du-Bro treaded wheels are narrower in width to fit inside wheel pants and retracts easier. Comes with 3/16" \(5 mm\) axle diameter and can be drilled out to 1/4 \(6 mm\) if desired. Comes complete with our positive seal air valves and inflator adapter. Diameter: 4.00" \(102 mm\), Axle Diameter: 3/16" \(5 mm\), Weight: 138grams/wheel, Width:1.175" \(29.8 mm\)