How do you measure a bmx bike?

Answer 1

When you stand the unicycle up in front of you, if it is at the right hight, it should come up to your bellybutton.

Answer 2

You unscrew them( remember that the left one has a left-hand thread) and measure the diameter of the threaded end with a vernier caliper. Should be either 9/16"(14.3 mm) or 1/2" (12.7 mm)