Tubeless tires are realy popular on the Mtb racing circuit, using both manufacturers systems as well as aftermarket systems like Stans Notubes <notubes.com>, which benefit the rider by reducing flats and allowing lower tire pressure to be viable. On a unicycle, however pinch flats don't occur very often, and I have only experienced one single puncture in my year and a half of riding. Has anyone tried using this system? Is it worth it? (it is pretty expensive, but split between two riders, it's not bad...)