I will not fly my bike at 40,000 feet, so I'll stick to air...
off course not at 40k feet, nitrogen plays its part when the jet tires land on runways, that is where the tires get massive pressure in regards of all the weight.
I have nitrogen in my car tires. The car runs much smoother and handles turn much better. The tire pressure also stays at the suggested level for a much longer period. When tires are at the appropriate pressure, they wear better and offer greater gas millage. The reason it is better than air is because the molecules are larger. Here is a pdf explaining the weight and size of nitrogen versus air.
off course not at 40k feet, nitrogen plays its part when the jet tires land on runways, that is where the tires get massive pressure in regards of all the weight.
Sooooo, you think that normal air is not capable of withstanding the pressures of landing? You are aware that air is almost 80% nitrogen right? LOL
Nitrogen is used in aircraft tires for the pressure stability when going to different elevation and temp extremes.
They (the car tire dealers) are pushing it to make a buck. Nitrogen in your car tires will help keep the pressure stable but you still need to check them every couple weeks, just like air. If you have your own compressor and you install a drier on it, you will have succeeded in getting most of the minor benefits of nitrogen without paying for it.