[AndyB]

I agree with waialua. making your own wheels usually doesn't supply much of an advantage on paper.

However, wheels are something that aren't particularly hard to machine. Making your own can give newer students a chance at machining something that can't be screwed up as easily as machining say- a gearbox.

Making your own wheels also just adds a coolness factor to your robot. It is something that you built and distinguishes your robot even further from everyone else's.