Scale Spokes offers special accessory packs with resin tires and photo-etched parts. The difference with the resin tire is that it is flattened.
After removing the rubber tire from the rim and cleaning up the resin tire, test fit it to the rim. Additional sanding may be necessary.
Once you are satisfied with the fit, place the resin tire on a flat surface and gently lower the rim assembly into the tire. Handle only by the edges of the rim since pressure on the hub or spokes can warp the assembly.
To seal the tire to the rim, you can put a bead of Pledge Floor Way with Future between the two.