I happened to be in Radio Shack tonight, and they have a line of RC cars that are close to 1/25. Along with the car kits, they're selling wheel sets for these cars. For about $10, you can get about 3 different sets of wheels. Tires are separate, I think.They also had a suspension upgrade kit, with 3 sets of coil springs in different colors (great for us NASCAR types). Kinda unusual, but it might help someone out.
Glenn