No, only the one that was made for it.
Yes you can, but take it to a bike shop or someone who knows what they are doing
Yes, all handlebars have the same diameter out by the grips.
Any 20inch forks will fit.
i think most stems fit but i would take it to the place you are buying it or take the messurements of the old 1
BMX makes many performance bikes. They come in many styles and specs to fit any rider. Check out http://www.performancebike.com and search BMX, you will find what your looking for.
A crank (or a crankset) is the thing that sits in the middle of the bicycle, has the chain on it and have the pedals attached to it.
It will if you have bmx (or bmx style) cranks.
Quite a few the most mainstream is Fit.
You measure it. A ruler and a caliper are useful.
No. a 9T sprocket will only fit a cassette hub, and not freewheel hubs.
No, there are several different diameters to choose from.
Rochester ny