Cool! I guess the solid wheels are meant to prevent someone's stick going through the spokes.
It still got pretty physical though:
And a couple of people got knocked off their bikes, although obviously the most spectacular crash happened just after I'd put my phone away.
They were having tons of fun. But, given that when setting out for the Drive, I managed to fall off my own bike before I even got on it*, I think I'd better pass.
*I also forgot my lock and had to spend $55 on a new one. D'oh!