A 20 x 2.25 tube
MAYBE - , frame size has nothing to do with tire size. Style does, and if its a mountain bike, it will not work with a 27 (road racing) wheel and tire. Brakes will not fit.
A 20 inch tire.
If you bought a new complete bike (not just the frame) you can look at the sidewall of the tires to find out what size you'll need. Many bike manufacturers also list tire requirements online.
The CO2 goes into the tire.
This bike uses the following tire sizes: Front tire: 2.50 X 14. Rear tire: 3.00 X 12.
13", tire size most likely P195/75R13s
It's very improbable that there's a special tire for that bike. Make a note of the tire size and you should be able to get a replacement at just about any bike store.
Most of the time, the tire will have the size on it. If not, you can look the size up online or have your local bike shop check the wheel size.
16" 130/90 is the standard tire very what size you now have on the bike to make sure on changes have been made.
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15 inches
That's not so easy to answer, as there's no guarantee that the bike still has the original tires. If it has any tires on it's usually printed on the tire sidewall what size it is. I'll post a link with info on rim / tire combos.