Someone try this and let me know if it works. I can see that in a MTB race this would be very fast with CO2 filling.

http://www.instructables.com/id/ECFUTKS5NREPORTJH9/?ALLSTEPS

Interesting idea. The only problem I can see with it is adding more weight where you least need it, at the wheels. Unfortunately the only application I could see for the reduced time replacing tube would be in a race but at the same time that would be when you want the least weight at the wheels.

Still this is very interesting, would love to know what others think, and if anyone does this what they think?