Thomas Palm designed and 3d printed wheels for his RC Truggy car which can go on snow covered surfaces. If you have some basic CAD skills you can adapt them to fit your RC project.
Here are the spiked tires:
You can get the files here:
http://www.thingiverse.com/thing:526969
Here are the spiked tires:
You can get the files here:
http://www.thingiverse.com/thing:526969