What this is: traditionally bicycles use innertubes. There's a
problem there because innertubes puncture easily and they
stiffen up the tyre. If you remove the innertube then you can
eliminate almost all punctures and you get a more supple tyre.
To do that, you need to make an air-tight seal. There have
been various approaches taken, either making an air-tight rim
and tyre combination as for cars, or using a rubber rim-strip
and a latex-based solution to form a seal. Here I show you how
to do this yourself for very little money using Al's HalfTubes and I've
gathered information on all the commercial Tubeless options I
can find.