A BMX stem is what connects the handlebars and forks to the frame.
To fix BMX handlebars, you might need to bend the handlebars back to their correct position. You might also need to tighten the bolt that anchors the handlebars to the bike. Fixes will vary depending on what is wrong with the bike.
yes
Yes, all handlebars have the same diameter out by the grips.
There are a few places where one can purchase a BMX cruiser. This includes going to a BMX bike store, as well as looking at cruisers online on sites such as eBay.
Tighten the stem
you can searh online on skatehut , winstanleys bmx and dogg scooters are the best.
you probably want to replace them. They can be pretty cheap to buy off the internet.
the fork gyro (if have) and stem and mostly important the headset
the bmx?cruiser? or chopper?
It´s the Stem, it holds the bars and match with the frame with the help of a headset.
no but you can get a dirt bike or a cruiser bike or a speed bike but i havnt seen a bmx bike yet.