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Here's a little tool I came up with for sanding tires. It's cheap, easy to build, and easy to use. All parts are available at your local hardware store, and include: 1/4" bolt, long enough to have a shoulder or shank around 1/2" or longer 2 nut inserts or panel nuts with 1/4" thread ( not sure of the actual name, see picture 2 beveled faucet washers (should have ~1/4" hole) . Insert the panel nut into the broad end of the faucet washer. Make sure that you have selected these parts to have a reasonably snug fit. This can be verified while at the hardware store Cut the head off the 1/4" bolt and clean up the cut with a file. Thread the two washer/panel nut assemblies on the bolt with the small diameter ends of the beveled washers facing each other. You should have a long enough shank on the end to chuck up in a small electric drill. The one pictured is a little short, but still works great. To use the tool, assemble the facing washers hand tight with a tire between them. The beveled shoulders of the faucet washers should fit a variety of common 1:25/1:24 scale tire sizes. Fire up the drill and sand away being careful not to sand off all the tread unless that is your intent.. I use a variety of sand paper grits as well as wire brushes.