nitrogen

[Rev. That Guy]

well there is some other things about nitrogen as well. Aside from its lack of expansion/contraction with temperature (moreso an issue when running the tires hot from use rather than ambient temps), but it is also a physically larger molecule. Contrary to popular belief, rubber tires do "breath." Air can not only seep from the bead of the tire but through the tire as well. In theory, nitrogen should help prevent pressure loss over time as you would see with regular air. In practice, however, I have found that not to be as much the case. While it does seem to make a marginal difference, the cost is usually not worth it.

Just use air. check you pressure often. Pressure doesn't need to be spot on perfect every time as most sport bikes allow a wide range of pressure. Your bike, usually on the swing arm left side, will have a sticker telling you what pressure to run. Remember, this is an EPA thing so the pressures are usually pretty high to reduce rolling resistance. for better traction you can run lower pressures but generally at the cost of fuel mileage and tire wear. Its a compromise. For example, my RC recommends 36 front and 42 rear. I usually run about 32-33 PSI front and rear. I have found that the difference in MPG is negligible and the grip is WAY better and more planted feeling. The ride is also more conforming and comfortable. I am sure this is at the expense of tire life but I'm good with that in exchange for better traction. The tires also warm up faster with the lower pressures.

Some people run as low as 26-29 PSI but usually only for track use and I DO NOT suggest that for the street. 30 is about the lowest I would run if I was really pushing the tire.

- Justin