101.6mm (4") x 29.8mm Large Scale Treaded PVC Wheel for 5mm Axle from Du-Bro - DUB400TV
These 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 positive seal air valves and inflator adapter. 1 wheel\/pkg.
Features:

Reasonably lightweight
Narrow width to sit inside wheel pants and retracts easier
tough and rugged exterior skin