tire pressure

[Pauley]

Damn. He probably put in 21% oxygen too and a bunch of other stuff like CO2!


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[shdwghst457_imp]

My dealer filled the tires with nitrogen at delivery and claimed I would see a benefit from it. I'm running the recommended 36/42 and have felt no reason to change. I'm still waiting to discover the mysterious benefit I will get from having nitrogen in the tires.

The benefit is that nitrogen doesn't expand (or contract) nearly as much as oxygen does, so fewer cold-weather low-pressure situation.

I really didn't expect this to turn into such a lengthy thread! I pulled into Discount Tire on my way to work (where the general response was "why does that car only have two wheels?') when I found out that the dealership had overinflated the back tire. Thank you all for the great info here!

In the Prius world it's common to run 3PSI over spec to get better mileage. On that note, I replaced my totaled white one with a 2014 red one to match the CB! CB doesn't need a solar panel to keep the interior cool though

[Red Mist_imp]

My dealer filled the tires with nitrogen at delivery and claimed I would see a benefit from it. I'm running the recommended 36/42 and have felt no reason to change. I'm still waiting to discover the mysterious benefit I will get from having nitrogen in the tires.

The benefit is that nitrogen doesn't expand (or contract) nearly as much as oxygen does, so fewer cold-weather low-pressure situation.

I really didn't expect this to turn into such a lengthy thread! I pulled into Discount Tire on my way to work (where the general response was "why does that car only have two wheels?') when I found out that the dealership had overinflated the back tire. Thank you all for the great info here!

In the Prius world it's common to run 3PSI over spec to get better mileage. On that note, I replaced my totaled white one with a 2014 red one to match the CB! CB doesn't need a solar panel to keep the interior cool though

I run my cars at maximum pressure recommended on the sidewall (not above!) and the gas mileage is much better than what the recommended "comfort" pressure can provide. Between 38-40 psi depending on the tire. Ride is a bit firmer but 10-15% better mileage on the open road.

[redbirds_imp]

Hey Redbirds,

My dealer filled my tires with 78% nitrogen. Seems to work pretty good...

I do too when I bring the tires back up to proper level. No wonder i'm not noticing the "difference".

My dealer filled the tires with nitrogen at delivery and claimed I would see a benefit from it. I'm running the recommended 36/42 and have felt no reason to change. I'm still waiting to discover the mysterious benefit I will get from having nitrogen in the tires.

The benefit is that nitrogen doesn't expand (or contract) nearly as much as oxygen does, so fewer cold-weather low-pressure situation.

I really didn't expect this to turn into such a lengthy thread! I pulled into Discount Tire on my way to work (where the general response was "why does that car only have two wheels?') when I found out that the dealership had overinflated the back tire. Thank you all for the great info here!

In the Prius world it's common to run 3PSI over spec to get better mileage. On that note, I replaced my totaled white one with a 2014 red one to match the CB! CB doesn't need a solar panel to keep the interior cool though

The benefit is that nitrogen doesn't expand (or contract) nearly as much as oxygen does, so fewer cold-weather low-pressure situation.
If that is the benefit, it's strictly a placebo effect. I have had to adjust pressure in the CB's tires as often as I have done so in the wife's V-strom which has the "78%" mixture. My limited knowledge about Boyle's Law and my many years as a scuba diver would lead me to believe that no one could truly see a difference in the expansion rate of pure nitrogen and "air" which is mostly nitrogen. I would think the moisture content would have far more to do with it as bottled nitrogen is essentially "dry" with near zero moisture content. On the other hand, using nitrogen would not have any adverse effect either.

[cbfan_imp]

Digital gauges are pretty accurate (they are programed by a chip). I use two, portable when inflating and TPMS..........they are within +-.5 pounds of each other. My TPMS also have tire temperature.........boy, was I surprised the first time I did extended ride in the summer.......with a cold pressure of 41-2 psi after about an hour of riding temp was up in the mid 50's range. I have 3 bikes with TPMS and they all read the same accuracy.
Being a retired aircraft tech, nitrogen has been used in aircraft tires since..............a very long time ago. Nitrogen is stable but the big thing is you don't want moisture inside a tire, moisture cause corrosion and can freeze at altitude.

[Lord Popgun]

cbfan,

I asked the Navy aircraft tire mechs at work and they said the same thing you did. N2 is dry so no corrosion from moisture.

I think for non-race cars the big effect is on the dealers profit line. YMMV

[cbfan_imp]

And this applies to oxygen. Aviators oxygen has no moisture whereas oxygen used in hospitals has alittle moisture cause it makes it easier on our nasal passages.

[shdwghst457_imp]

Here's a PopMech article that seems to sum it up pretty well. While it does mention a more constant pressure, I'd vote that the most important aspect is the lack of moisture.

http://www.popularmechanics.com/cars/how...ns/4302788

[Red Mist_imp]

Well, unless we are going to keep some dehumidified nitrogen around, in a high-pressure cylinder in our garage, nitrogen is just a gimmick. It's going to leak out and need to be replenished with good old "air", which is readily available and easily compressed, stored, and transferred.

And I dislike those green valve caps, too.

[Tortuga_imp]

Well, unless we are going to keep some dehumidified nitrogen around, in a high-pressure cylinder in our garage, nitrogen is just a gimmick. It's going to leak out and need to be replenished with good old "air", which is readily available and easily compressed, stored, and transferred.

And I dislike those green valve caps, too.

Amen to that!