thats not a bad idea. any idea how much weight?Yep. It's a bit lighter. Saves on rotational weight. I know alot of people say its a lame idea as its easier to pinch or puncture. However I have had very good luck with the setup. I have run 16" tubes in my BMX bike for years. When I started riding mtb 2 1/2 years I slapped 24's in it right away. In 2.5 years I have NEVER had a flat. Consider it lucky or not. I have a theory on how they work better, but I won't go into detail.
-Kevin