I mean, I'm no Fluid Dynamics Engineer, but air under pressure will be in every nook and cranny in that tyre. A 29 x 2.5 tyre has about 4litres of volume...a litre of air weighs 1.2ish grams. Filled to 30psi, thats 9.6grams of air, which they are not removing...just somehow manipulating it a bit, are they trying to make it spin with the tyre? would it do that already? or just be turbulent? In any case I've probably over-thought this already and you might be better off doing a big fart before you start your ride, or better yet out of a corner. BRAP!
