Generally speaking aluminum frames have larger diameter tubes than steel or titanium bikes, but the most obvious is to test with a magnet. If it sticks it's a steel frame. If it doesn't it's probably aluminum. Titanium frames are still so rare that you are very unlikely to buy one w/o knowing.
The type of bike that is mostly used form BMX riding are the purpose-built BMX bikes.
A street bike is a type of BMX bike, so your question can't be answered.
No, a BMX bike's serial number does not uniquely identify it as a BMX bike. Serial numbers are used for tracking purposes and do not indicate the type of bike.
You can find high-quality yet affordable BMX frames for sale at online retailers such as Amazon, eBay, and websites specializing in BMX gear like Dans Comp or Albe's BMX. Additionally, local bike shops or classified ads may also have good deals on BMX frames.
A Harro is type of BMX bike
BMX bikes pretty much all have 20"wheels, which makes all frames very similar in size. On top of that BMX is almost entirely ridden standing up, so bike size doesn't matter as much as it does for road riding for instance.
to be honest gt biek frames suck, their company is just poor and they need money for their thirty pound frames. that is why they are about 300 dollars and 800 for a complete bike get a premium if you are looking for a good bmx company
well it all depends on what type of BMX you do. For me i do park and vert. And i use a fit bike. But for flat land the best type would me strowler. But like i said these so many diff rent forms of BMX.
you can find a BMX bike in halfords
The bmx thruster rampage bike is a exellent bike
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'.
A hyper is better