If the bike is complete right now, easiest thing is to read on the tire sidewalls. Somewhere there should be embossed the tire size. You can usually go a bit either wider or narrower on the same rims, but you can't change diameter.
If you find them, use the millimeter size. Inch sizes can sometimes be misleading, with several different sizes using the same numbers. There's about five different 26" for isntance which can't be mixed.
It's a dead-standard BMX, so it has 20" wheels.
There are different sizes for dirt bike wheels as there are for regular bike wheels.
Not necessarily it depends on the size of the bike.
The safety bike was different in that both wheels were the same size.
The safety bike was different in that both wheels were the same size.
Depends on what size wheels the frame is made for. You could have an 18" that is meant for 20" BMX wheels, or 26" MTB wheels or 29er MTB wheels. Getting the wheel size wrong is unlikely to result in a nicely rideable bike.
Depends more on what type of gears that you have than it does on the size of the wheels. If the gear levers are the same type as on a bigger bike the 24 inch bike will shift just the same way.
Almost 100% definitely not.
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.
the overall frame size. not specific to wheel size, as most mtb wheels are 26 inch.
Impossible to say, as it depends on the size of the wheel. To find out, calculate the circumference of the Wheels.
The safety bike was different in that both wheels were the same size.
The safety bike was different in that both wheels were the same size.