Yes, all handlebars have the same diameter out by the grips.
fit originals or the animal grips
it may be a snug fit but it is doable
No. Grips and handlebars are fairly well standardized, so pretty much any grip will fit.
no. the can be any brand
odi grips are he besst grips or oury grips
Yes they do. I put bike grips on my razor scooter and they fit on ok but they are a bit long.
yes any grips will fit them
Any 20inch forks will fit.
No, only the one that was made for it.
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
Depends on the diameters of the bars. Usually, but not always, they're the same and can use the same grips.
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.