The ether sprayed inside the tire is ignited. The "explosion" expands the space inside fast enough to press the tire against the wheel before the air can just blow by and escape. Then, you just inflate normally. Practical, yes, but very cool to see.
(YouTube Comment Quote)
(, Fri 23 Jan 2009, 10:18, Reply)
when they was traveling to the north pole
(, Fri 23 Jan 2009, 11:42, Reply)