Smaller wheels are proportionately stronger than bigger wheels, which is good for hard riding. Smaller wheels are also easier to accelerate, which is good for short distances and frequent stops. Smaller wheels can be fitted in a smaller frame, which makes the bike all over more manouverable, which is also good for tight racing, tricks and jumps.
To save weight and because the wheels are smaller than normal. With smaller wheels you need another gear ratio to get up to speed.
Because they have small wheels. To get any speed out of a BMX they have to have small sprockets. It's all about ratios.
All "true" BMX bikes are built for 20" wheels, which makes them very similar in size.
BMX bikes are pretty much all in the same size with 20-inch wheels, so if you're really getting a BMX there isn't much of a choice.
There are MTBs with 20" and 24" wheels for smaller riders, which probably is the closest thing to what you're describing. These wouldn't be BMX bicycles though, since BMX bikes don't have gears and have a taller handlebar than a mountain bike.
bmx's are made for trick and stunts and only have one gear & they don't have suspention they are also smaller , mountain bikes are more for terrain because they have gears and suspention and are a bigger
Just about all MBX bikes use 20" wheels, which makes them all very similarly sized.
yes they do
Pretty much all BMX bikes are the same size - 20 inch wheels.
BMX bikes weren't around in the 60s.
I have no idea what you mean by a "bmx bikes device".
in my opinion i rate haro bmx bikes,gt bmx bikes and redline bmx bikes as the top 3 bmx bike brands