No. a 9T sprocket will only fit a cassette hub, and not freewheel hubs.
Not a sprocket only, but you can buy a 23-tooth freewheel that should fit.
no. the can be any brand
The BMX bike stems are used just like any other bike stems for most any brand. The stems hold together the base of the bike and the steering part or the handlebars.
The way you ride any bike.
You can purchase a BMX bike helmet from any retail bike shop, online or a store like Walmart . You can also look on ebay or craigslist for a BMX helmet
One can buy a custom BMX bike in Las Vegas from a few stores. One can get a BMX custom made from 'Just BMX', 'Bolder BMX', 'Bike World' and 'Vegas Bike Store'.
It's not really a question of better, more of different. What decides how fast the top speed of the bike is, and how nippy it is off the start is the ratio between the tooth count of the crankset, and the tooth count of the freewheel. With a smaller freewheel you can have a smaller crankset, a slightly lighter bike and get the same feel of the bike as with a bigger crankset and a bigger freewheel.
A hyper is better
no but you can get a dirt bike or a cruiser bike or a speed bike but i havnt seen a bmx bike yet.
The type of bike that is mostly used form BMX riding are the purpose-built BMX bikes.
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A street bike is a type of BMX bike, so your question can't be answered.