[aldaeron]

I think this needs some clarification.

There are molded rubber wheels of various types, most of which are molded onto plastic hubs to keep them light. Some have a molded tread pattern (AndyMark HiGrip). Some are molded flat (Colson Performa, AndyMark Stealth). Some are pneumatic (AndyMark).

There are also solid metal rims that accept tread (wedge top, pebble top, blue nitrile)

Others are molded flat rubber, but not great for driving (Banebots, Battle Treads (heavy), Various Other Urethane Wheels (for shooters) )

-matto-