~ Dave Ruston
Are you averaging the flaccid and erect measurements and then diving by pi or which one are you using to determine the correct inner diameter. Just provide the formula please ?. Maybe I’m just missing something but the verbage seems to be missing part of the equation.
The primary measurement for a cock ring is your erect size. In many situations, it gives good results. However, certain users report somewhat incorrect results with this method. It happens because most people need a cock ring that is a bit smaller than their erect size. This is why there is a recommendation to measure both flaccid and erect sizes, just to be on the safe side. However, chances are that the erect size will be enough for many people.