Aircraft tires can be filled with regular compressed air, however pure nitrogen is also often used.
Air
Nitrogen is filled in aeroplane tyres.
They are multi-ply tires filled to very high pressure. Most jet and large airplane tires are filled with nitrogyn.
They are filled with air, which is a mixture of gasses, so yes they are filled with gas
Helium is lighter than air. So, tires filled will helium will help the tire rise up in the air.
With the proper pressure, no.
F1 tyres are filled with Nitrogen since it is a more stable gas than air
Any "tire store" will be able to do it for you. But you will be unpleasantly surprised at what it costs to get your tires filled with a gas that comprises almost 80% of earth's atmosphere.
Nitrogen is a dry, inert gas used to inflate airplane tires, off-road truck tires, military vehicle tires, and race car tires for improved performance, more tire mileage and better fuel economy.
nitrogen
Bicycle tires have tubes, so you wouldn't have a tire filled with Slime. There are tubes pre-filled with Slime though.
they are filled up with regular air that our tires use but some cheaters in monster truck racing fill their tires up with water to make sure they land on all fours.