Nitrogen will NOT do any damage to your tires. Run the preasure that gives you a full contact patch.

 

ALL tires are filled with at least 78% Nitrogen - our atmosphere is comprised of 78% nitrogen.

It is UNSAFE to operate any tire at a pressure lower than 75% of the "Max Cold" listed on the sidewall - so in your case 55 PSI x 0.75 = 41 PSI is the MINUMUM safe pressure.

Why Nitrogen? Well "regular" nitrogen will not gain you anything at all except for a lighter wallet. DRY nitrogen will reduce the fluxuations in tire pressure due to moisture in the tire - IF all the "air" trapped in the tire is bled out after it's mounted on the rim (this almost never happens). What you really gain is not from the use of nitrogen, but from the reduced moisture content in the tire.

 

would i be able to fill my nitro shocks with that same system or do i go else where?

 

ALL tires are filled with at least 78% Nitrogen - our atmosphere is comprised of 78% nitrogen.

John, ya beat me to it. I run at least 78% LOL

 

i have 38" swamper SSR's and i just got them filled with nitrogen last week, they told me if i put more than 38psi in them that they would overheat and warp the tire, the tire is rated for 55psi.

can anyone second what they told me? or go back and fill it up to 55psi??

thanks

Nitrogen does not expand very much when heated. Air expands when heated which in turn increases tire pressure.
I used nitrogen in my race and rally tires to reduce the handling difference between a hot and cold tire.
Nitrogen in a non-competition tire is a waste.
Go to the local gas station and fill your tires with regular air.
Dave

 

Need to fill the tires with helium it'll make the truck lighter as you float down the road LOL

 

It is UNSAFE to operate any tire at a pressure lower than 75% of the "Max Cold" listed on the sidewall.

Complete BS.

Where did that come from? :damnit

Tire pressure is based on temperature, load and speed.

The correct cold air pressure for any tire (mounted on correct rim) under any load can be calculated by dividing the actual load by the tire's max cold capacity and multiplying by the max cold pressure.

A 265/75E16 rated to 3415lbs at 80PSI mounted on a 7" rim on the rear of an empty SRW truck (2900lb axle weight) will not require more than 35PSI to wear evenly and function perfectly safely.

2900 / 6830 = .4246 X 80 = 33.9PSI

I usually round up to the next 5PSI, so 35PSI would be the correct (and safe) pressure for this tire under that load.

Throw in another 10-15% pressure for extended highway speed operation (40 in this case...still only 50% of the tire's cold capacity)

The same formula works for calculating overload too (common and safe with speed adjustments) but that's another discussion.




As far as running nitrogen, the benefits are not worth the effort out of competition or aircraft.

 

All of our aircraft tires run pure dry nitrogen at 375 psi. (that's not a typo, we really run 375 psi) Directly from Boeing engineers the benefits are:

• Pure nitrogen does not expand at nearly the rate that oxygen will (keeps tires from exploding upon landing)
• Nitrogen reduces corrosion/oxidation of the rim and valve core assembly
• Dry nitrogen virtually eliminates all impurities in the tire
• Nitrogen does not "leach" out pressure as bad as regular air therefore reducing the need to constantly re-inflate the tires (375 psi = a lot of leaching)
• Nitrogen does not compress as much as oxygen causing a greater load capacity on the same tire without over-inflating
• Upon a crash landing and fire, nitrogen tires will help to extinguish the flames versus feeding them with extra oxygen (I don't see how it would help that much but it's part of the reasoning behind using pure nitrogen)

Most of these reasons really wouldn't make much of a difference in our trucks. However, if I could find a local shop around here that uses nitrogen, I'm going to fill my tires with it as well.

 

:whs

Nitrogen does not expand very much when heated. Air expands when heated which in turn increases tire pressure.

Charles' law states all gasses expand at the same rate in relationship to their density (or was it Boyle's law :bang I should have paid attention in chemistry)

The primary reason for Nitrogen in (automobile) tires is to eliminate moisture, which WILL effect expansion/contraction with temperature changes as water changes from liquid to vapor, and possibly corrode your wheels.

Also (for aircraft) Nitrogen does not promote combustion :Thumbup:

 

haha well i guess i should have payed attention in chemistry aswell. all i thought it was, was another option to fill up your tires that might make a little difference lol