Not sure what you mean here.
If you are talking about the thin wires going from the center part of the wheel - the hub - to the outer part of the wheel - the rim - those are called spokes.
If you are talking about the fairly short, stubby things sticking out sideways from the hub, you're talking about pegs.
it turns the wheel
The only thing on a BMX regularly called a spindle would be the crank axle. Although I suppose one could use spindle for the pedals and the wheel axles as well.
the things on both sids of each tire on a trick bike or bmx bike are called pegs
Never
A female BMX rider is called a Betty.
No
There are two different hub designs for BMX, freewheels and freehubs. You need to know what you have if you want to replace the sprocket by the rear wheel.
change out the hub
they can range from 46teeth on a chain wheel all the way down yo a 22tooth chain wheel.
go on to this website called wiggle the bmx is on a sale 4 £260
The BMX bikes that you buy at Target and or Walmart are not the same BMX bikes that are used in BMX Racing and BMX Freestyle. Real BMX bikes are lighter, they have diiferent size sprockets among many other things. Feel free to google the National Bicycle League or the American Bicycle League to get more information.
They're called brake bosses, and you use then as attachment points for a certain type of rim brake.