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.
I agree, but get at least a 20.5" frame.
To determine the size of BMX frame you need for your bike, measure the distance from the center of the bottom bracket to the top of the seat tube. This measurement will help you choose the appropriate frame size for your height and riding style.
The standard BMX axle nut size for most BMX bikes is 3/8 inch.
The standard size of BMX axle nuts is typically 3/8 inch.
It depends on your hub. If it's unsealed, then the ball bearings have different diameters - you just need to find out which size you need. That's fairly easy. If it's sealed, there is going to be a number on the side of the seal - usually a 4 digit number starting with a 6. That number identifies your bearing dimensions, that's the bearing size you need.
The standard thread size for BMX pedal installation is 9/16 inch.
Different BMXes have different axle sizes. Easiest is to measure what you've got.
Bmx's don't come in sizes. They are all one size.
The recommended BMX bike tire size for optimal performance and control is typically around 20 inches in diameter. This size provides a good balance of speed, agility, and stability for BMX riding.
The recommended BMX tube size for optimal performance and safety is typically 20 inches in diameter.
SKILLS!!
what ever size fits them for their intended uses.
Different BMXes have different axle sizes. Easiest is to measure what you've got.