Nitrogen is sometimes offered as an alternative to air for tire inflation.
Nitrogen is an inert (non-flammable) gas – basically, nothing more than dry air with oxygen removed.
Air contains about 78% nitrogen. Because of nitrogen’s inert properties, it is often used in highly specialised tire service applications and/or demanding environments such as aircraft and mining applications. Nitrogen is also often used in motor racing.
For normal tire service applications, nitrogen tire inflation is not required. However, nitrogen tire inflation does not harm tires and may marginally contribute to reductions in tire inflation loss by permeation. Nevertheless, nitrogen will not prevent any tire inflation loss caused by punctures, tire/rim interface (bead) leaks, valve leaks, valve/rim interface leaks, wheel leaks, etc.
Whether inflated with air or nitrogen, regular tire inflation pressure maintenance remains critical and necessary. Use of nitrogen alone is not a replacement for regular tire inflation pressure maintenance.