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When you are not sitting on it.
Because the air inside the tire is under pressure. Gas always flows from a region of higher pressure to a region of lower pressure. As the pressure inside the tire is greater than the pressure outside, the air always comes out of the bicycle tyre.
Depends on the type of bike. A skinny tire road bicycle will have several times higher pressure than a tractor tire, while a wide tire Mountainbike can have anything between the double to 1/3 of the pressure of a tra tire.
Air is put in with a pump or a compressor, either way it becomes pressurised to inflate the tire.
If the tyre is inflated, yes. If it has been completely deflated, no.
how much air is in the tire
because air molecules build up inside the tire and push the rubber outwards which causes the tire to expand.
No. Low tire pressure causes poor handling and poor tire wear.
ANY tire gauge measures air pressure in PSI.
The inflation pressure is on the sidewall of the tire.
ok
Improper tire pressure or a bad toe out. Take it to an alignment shop.