What do you use for wheels?

[Andrew]

Every year, we get into the situation where we have to choose/design our wheels. We've ended up using highly modified 6" skyway wheels for the last couple of years and are generally happy.

However, we have to double them up to get the width that I like (2") and we have to knock out the bearings and make many other time consuming mods.

We have made polycarbonate wheels, but they have fairly low friction with carpet. We have wrapped wheels in timing belt, which had much better friction characteristics, but tended to de-bond.

I wanted to try knurled aluminum, but last year's rules threw that out.

I like the skyway beak-lok design, but the choices are too big and heavy for my tastes.

So, I wanted to see what other people have used or plan to use for wheels.