Due to the scale size of these wheels, in rare cases, the rubber tire may be slightly larger than the rim.
To get a perfect fit, here’s what you do: after you roll the tire off the rim, make a cut through the tire with a new blade in your hobby knife – you now have a tube shaped piece of rubber. Wrap the tube around the rim and carefully measure where to cut the excess. Cut or sand the end to the proper size. Glue the tube back onto the rim with CA.
If necessary, fill the cut with thin CA or filler. Sand and paint as necessary.
You should now have a perfectly fitting tire.