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Tire Pressure

gcain747

New member
I first posted this on the RT Touring form but then started reading the ship talk and thought maybe more people would see it here.

Let me start by letting everyone know that I am a new and happy Spyder owner. I read a great deal of this forum prior to buying my RT Limited. Because of all the great advice my first experience has been great and I just want to give back a little based on my other experience.

To begin with my son and I have raced oval track dirt and pavement cars for about 16 years. We have ran everything from dirt track go karts to 130 mph shifter karts on road courses and big cars up to late models and have a lot of experience with air pressure. I would like to pass on some of that experience to all you Spyder guys and gals.

First is air. We don't use air in our race car tires because air contains moisture. The more humid the air the more moisture you put in the tires. When tires get hot the moisuture turns to steam which increases your tire pressure. The more humid the air the more moisture and the more expansion when the tires are hot. We put nitrogen in our race car tires (and I put it in the Spyder tires) Nitrogen is a dry inert gas so it doesn't expand as much when it gets hot.

Second is your tire gauge. I read on one post where someone said that they tried 3 different gauges and none of them read the same. Here is what I do both at the race track and on the Spyder. On our race cars we have one gauge that we always use. When we go out to practice we set the tire pressure and make some laps. We then adjust the pressure according to how the car is handling. Some times we make as small as 1/4 psi adjustments. Air pressure is just a number. It is not magic. When I started riding the Spyder I used the gauge that came with the bike and I set the pressure at 18 and went riding. I came back and re-set it at 19. I did this several more times and found that with the gauge that came with the bike that 19.5 gave the best ride and handling. From now on I will only use that one gauge to set the pressure. If you used a high dollar gauge like the one we have from Longacer for our race car the actual pressure may be 18 or 21 it really doesn't matter. As long as you always set the pressure with the same gauge and with the tire at or near the same temperature you will be just fine. The whole idea is to find the sweet spot where your bike handles the best with the gauge you are going to carry with you.

By the way, we picked up our Spyder last Thursday and rolled over 1000 miles as of Monday night. Thanks to Sypderpops and all of this forum we didn't have any heat or handling problems problems.

Hope this helps folks.:2thumbs::spyder2::yes:
 
:welcome::congrats: and thanks for the input.. Using nitrogen sounds like a great idea.. I do in my auto, don't know why it didn't occur to me for the :spyder2:
 
Nitrogen

Air is 79% Nitrogen. The problem with air is the moisture that is in the air. If you live in AZ and have very low humidity then you don't have a lot of moisture in the air. If you live in an area with high humidity then the air has a lot of moisture in it. The moisture is where you get so much expansion. Nitrogen and Oxygen are seperated by freezing air. Oxygen freezes and turns to a liquid at -297 f and Nitrogen freezes at somewhere around -327 f. That is how gas supply companies seperate the 2 gases. Before they chill the air to freeze it they run the air through a dryer system first to remove the water from the air. When you use a regular air compressor it takes in everything and compresses it. When you use air from an air compressor you put a lot of moisture in it. If you check your tire pressure when it is cold outside and then ride for a while and the tire heats up the air in the tire will expand and this expansion causes the pressure to rise. That is why many tires will be stamped for a given pressure when hot. Pure Nitrogen has little or no moisture in it so when it is hot it does not expand like moist air does.
 
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My Brother who lives in Florida when he brought his car in for service they talked him into using Nitrogen in his tires, [dealers will try to sell you any thing whether you need it or not] Well he drives up to N Y sees one tire is low, Now hes in a panic because he can't find a place that has Nitrogen in the wilds of N Y. I know he could have just used air in that tire, BUT:dontknow:
 
Air / Nitrogen

Adding air to a tire with nitrogen in it is not a problem. The biggest problem with dealers and nitrogen is the rediculous price they charge for it. A large cylinder of high pressure nitrogen cost them about $20.00 and they can fill up a bunch of tires from one cylinder. I know with our race car we go through a 300 cubic foot (3000 psi) tank about once a year and we are filling a lot larger tires than the front tires on a Spyder. I would guess that you could fill about 150 to 200 front tires from one large cylinder. If you have a friend that works at a welding supply company he would probably fill them for nothing. Nitrogen is the lowest cost per cubic foot of gas that a welding supply company sells.
 
I used nitrogen in my airplane tires and use it in my new car. The car actually came filled with a membership to a sort of 'nitrogen club'. I think they are in every city but don't actually know how much it would be for the Spyder.

You can buy your own nitrogen on line and then have it refilled at any welder supply. To me that is the preferable way to go.

I know there is debate about this but remember nitrogen is inert. Oxygen is not. Oxygen is thermogenic. Nitrogen is not. The moisture issue is a nice side effect of the necessary process of separating the two gases.

Also, even though I don't have one right now, I used to have a great gizmo that attached to two tires at the same time through a pressure gauge. You balanced the two tires to be exactly the same and then bled off excess depending on your chosen pressure. Sure wish I remembered where I got that toy.
 
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