A short question on the side, if I may.
When a fresh tire is taken from the store and installed on a rim, it is obviously initially filled with ambient air at atmospheric pressure. How is the air flushed out and replaced with pure nitrogen? Is it inflated, deflated and again inflated until mathematically only minuscule traces of oxygen are left; will simply pressurizing it to the required value with pure nitrogen do, or are there any other methods used?