Once installed all you need to do is sand the tire lightly to true it up and remove any convex or concave centers, and away you go. This can be done easily using a 120 grit garnet sand paper or emery board, then finish with a 240 or 480 grit. A recommendation from Paul Gage: If you wish to glue on the rear tires, use a clear nail polish. Just clean the tire with acetone, lightly sand the bead on the hub, paint a generous layer on the inside bead of the hub, paint the outside bead of the tire, then mount the tire. Allow one hour to dry, sand them true, and away you go!