Originally Posted by Crx_In_Motion
yes nitrogen is more dense then air......hellium is less dense and "lighter" i guess you would say.....But IMO why would u want "lighter tires"..... also hellium is'nt flamable , it is an oxidizer though. and yes hellium does expand, as with all other gasses if heated.
~jake
why wouldn't you want lighter tires? Ligher rolling resists I don't to much to make a difference but if it is lighter than nitrogen and air why not