82.5mm (3.25") x 25.4mm Diamond Treaded Polyurethane Wheel Set for Multiple Axle Sizes (2 Pack) from Robart - ROB134
If you have a scale airplane that deserves the very best look no further than Robart for your scale wheel choice.  These scale wheels are accurate down to their treads and side wall markings, and they're the perfect wheels to give your aircraft the finishing touch and unmistakable look of realism you demand.
Designed to fit 1\/8", 5\/32", 3\/16", and 1\/4" axles, the wheels come complete with plastic hubs, spoked and smooth hubcaps and two tread styles.
Features:

Scale replica aircraft Goodyear all-weather tires from WWII
Three different hub styles: 8-Spoke (P-51), Smooth (P-40) & Open wheel
Adapters for different sizes of strut wire: 1\/8", 5\/32", 3\/16" & 1\/4"

Includes:

Two 3.25" Diamond tread scale tires on gray nylon wheels
Four 1\/8" Adapters
Four 5\/32" Adapters
Four 3\/16" Adapters
Four 1\/4" Adapters