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I know this has been bandied about considerably but many of you, especially those of you with advanced setups have progressed to the point where you really should be using nitrogen in your tires. Without getting into specifics I can tell you the expansion rates of nitrogen over humid air is incredible.
The main purpose of using nitrogen is consistency. Running later in the day when the track temp is hotter is when nitrogen will pay dividends. The difference in air vs nitrogen can be as much as 5-6 pounds and if you're running on the ragged edge of your tire's pressure limits this can be important. I realize that having a nitrogen bottle around can be a pain but if you have 2 sets of tires for race day then fill both up at your house and then find a larger air tank and fill that for making up pressure at the track.
Again the only thing you have in contact with the track is those 4 contact patches and that's where you need a lot of consistency, which is the main benefit of nitrogen.
The main purpose of using nitrogen is consistency. Running later in the day when the track temp is hotter is when nitrogen will pay dividends. The difference in air vs nitrogen can be as much as 5-6 pounds and if you're running on the ragged edge of your tire's pressure limits this can be important. I realize that having a nitrogen bottle around can be a pain but if you have 2 sets of tires for race day then fill both up at your house and then find a larger air tank and fill that for making up pressure at the track.
Again the only thing you have in contact with the track is those 4 contact patches and that's where you need a lot of consistency, which is the main benefit of nitrogen.