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 BMX axle nut size for most BMX bikes is 3/8 inch.
The standard size of BMX axle nuts is typically 3/8 inch.
The standard thread size for BMX pedal installation is 9/16 inch.
The standard wheel size for Brompton bikes is 16 inches.
The standard wheel size of a Brompton bike is 16 inches.
20'' wheel size ,and roughly 25 pounds in weight ^_^
The standard bike wheel size for most bicycles is 26 inches.
The standard size of the axle nut for a bike wheel is typically 15mm.
The standard size of bicycle wheel bearings is typically 1/4 inch in diameter.
The standard BMX hub spacing measurement for most modern BMX bikes is 110mm.
The recommended rim tape size for a standard bicycle wheel is typically 18mm to 22mm in width.
it turns the wheel