[Dick Linn]

We've used the 8 inch (nominal) Skyway pneumatic wheels for a couple of years. The ones that are available with the 5/8 inch bore and keyway. They are a bit taller than 8 inches. We generally end up with more traction than we really need, at least on carpet. I'd prefer 6 inchers, but these are easy to work with and fairly inexpensive. They do tend to bounce around, though. We were using 4 CIMs and the kit gearboxes with about a 1:2 further reduction to the wheels.