This is a great product that I've been using a LOT!
It lets you swap tyres from rim to rim. For carpet this is especially great, because you really only need one or two sets of tyres. They never wear out.
This literally takes only a few seconds to swap rims. The fit is tight so there's no slippage.
They work well on wheels with a large flat section. Wheels with two raised bars are quite difficult. The method is very simple though.
Slip the o-ring over the wheel near the outside. It's best to put a twist in it.
Sit the rim on top,
The push down. Finished.
One minute for a whole set.
Benri Desu Yo! That means EASY!
By the way, wheels featured here are these... 4 Spoke wheels from Street Jam.