Cycling in Sydney Australia
On an associated topic, I've always wondered by an inert light gas like helium isn't used in tires.
blah blah blah rotational mass theories and all that can surely benefit from this wouldn't it?
He is probably 2 x-pensive. Now, neon is lighter than argon and could also be used to light up the bike.
But the real goer must be hydrogen. Nothing is lighter, you can get it readily by electrolysing water and it can also be used to blow up the bike.
Oh the humanity
However the teensy little molecules would leak out faster. Probably.