Flatland Concept

I'm looking for something that will be more comfortable for flatland
transportation. Bigger wheels are better for tough European boardwalks.

While the concept here looks cool with its big 200mm wheels, I currently
see no way to produce the wheels. Urethane needs to be thicker and more
narrow. Inflated would need ridiculous pressure. Solid rubber has to be
very soft or it won't last, thus making it slow.

And, of course, the wheel rims will be incredibly expensive.

I might continue working on it but this here will never see the light of day.

The wide wheels do not really make sense. I did another rendering with smaller wheels and
fenders (the pic has some 3D quality issues):

Older freehand sketches:

Wheel with integrated spring (upper right):