powderman426 wrote:
I guess it depends on your comfort level. I would put on the metal valve stems and use the 80% nitrogen mix.
For those that didn't catch it, air is 78.09% nitrogen. So, use metal valve stems and air. A difference of 1.91% nitrogen is irelivant.
EDIT. The difference in 78% and 100% nitrogen is questionable. The major difference is that 100% nitrogen is dry and air can contain variable amounts of humidity (water), which is another debatable topic. Race cars use 100% nitrogen because it eliminates a variable. Repeat performance is very important when a 500 mile race can be determined by a tenth of a second.