Try this...

http://www.tirerack.com/tires/tiretech/techpage.jsp?techid=73

Where info on air pressure than you'll ever want to know. Or maybe not!

 

A chart is going to be hard to find.
In order for a chart to be 100% accurate, it would have to take into account the volume of air contained in your specific tire on your wheel and also the composition of the air, including moisture content.

 

The term, "check tires cold" is referring to ambient temperatures, what ever it is.

 

More info...

There is more info in this thread: http://gl1800riders.com/forums/show...m/forums/showthread.php?253280-Tire-pressure-when-temperature-varies-35-degrees . See post #8 for a chart.

Ron Fuller

 

 

Chart-Smart. You don't need no stinking chart!

Just kidding. As shown in the fine chart in post #6, just add or subtract 1 PSI for each 10 degrees the ambient temperature varies from 65 F. So if it's 55 F, you simply set your pressure 1 PSI below whatever desired "cold" pressure is (i.e. if you want 41 PSI cold, set it to 40 PSI), It it's 85 F outside, set your pressure to 2 PSI above your target pressure (i.e. if you want 41 PSI "cold" set your tires to 43 PSI).

 

:agree: with jimwinger


Ken

 

thanks for the help.

 

tire pressure

You may want to check out filling with nitrogen. Your pressure will remain constant and won't need to be checked as often.

 

Car Tire industry standard practice is to allow 2-4 psi if your tires are warm ( meaning been rolling more than a mile). So if you want 32psi in your warmed up tires you would put about 35psi as it registers on your tire gauge. I wouldn't think there is any difference in MC Tires. I do not know of an exact answer because the actual air temperature will affect PSI as well

 

You may want to check out filling with nitrogen. Your pressure will remain constant and won't need to be checked as often.

Agree

 

wmduncan42
If you are talking about the tire pressures staying constant while you are riding you are wrong. I have been running nitrogen in the tires of my 06 GoldWing for years and I can see on my Smart Tire system the tire pressures rise as the tire temperature increases. If you are talking about not having to add nitrogen to the tires as often thru the riding season then I would agree but you still need to somehow check your tire pressures.
Ken

 

There is a reason why car and tire mfrs don't get involved with charts. They are not accurate. The only accurate way to check tire pressure is cold. There are simply too many variables. Weight, speed, and driving style all affect tire pressure, just to name a few.

Tire designs take into account increasing pressure. As long as your vehicle and tires are not overloaded, checking pressure in the morning is all you will ever have to do.

 

You may want to check out filling with nitrogen. Your pressure will remain constant and won't need to be checked as often.

Sorry, this tale is simply not true. Nitorgen behaves the same in its pure form as it does in the normal atmospheric mixture form. Pressure of a gas is a linear function of temperature.

 

To be redundant;
The volume/pressure/temperature relationship is constant so 1 psi for every 10 degrees F ambient above/below the "cold" set point of 68F is pretty accurate. But, of course, you cannot know how much the tires have heated from rolling friction, so you have to check your tires before riding or after it has sat still for a long time. So, the 1 psi per 10 F can be used to check your tires first thing in the morning in high or low ambient temperatures. If the ambient temp is 90, (90-68= 22) so you should read about 2 psi higher than your normal "cold" set point. If ambient is 30F, (68-30 = 38, the reading should be about 4 psi lower than the set point. Easy to remember and pretty accurate.

 

We will be traveling thru Colorado soon. What is the consensus for elevation changes and air pressure?

Sent from my HTC One using Tapatalk 4 Beta

 

i've tried @5 different tire gauges and they are all different, how criticle is the pressure?

 

i've tried @5 different tire gauges and they are all different, how criticle is the pressure?

 

Your tire will gain 1psi for every 10 degree increase in temp.

 

We will be traveling thru Colorado soon. What is the consensus for elevation changes and air pressure?

A Google search using the following: site:gl1800riders.com/forums tire pressure altitude will show some past threads on the subject. Tire pressure gauge reads about .5psi higher per 1000' increase in elevation.

Ron Fuller

 

Goodness.....some on this forum really like to worry about things they needn't worry about....nonetheless for the record:

Universal gas law

PV = nRt

pressure x volume = number of moles of gas x gas constant x temperature

R = 8.314 joules per degree Kelvin
T is absolute temperature (degrees Kelvin)

As temperature increases so does pressure at constant volume....the more gas the higher the pressure (WOW!)....I am guessing that the tire manufacturers are aware of this amazing scientific fact and have taken it into account when publishing cold tire pressure requirements
AND
I bet they have done all sorts of measurements and stres tests on the tires taking into account lots of variables

For me....I check pressure in the AM.....very, very occassionally I have to add some premium 78% nitrogen blend....this has worked for the last 30 or so years of motorcycling

 

Goodness.....some on this forum really like to worry about things they needn't worry about....nonetheless for the record:

Universal gas law

PV = nRt

pressure x volume = number of moles of gas x gas constant x temperature

R = 8.314 joules per degree Kelvin
T is absolute temperature (degrees Kelvin)

As temperature increases so does pressure at constant volume....the more gas the higher the pressure (WOW!)....I am guessing that the tire manufacturers are aware of this amazing scientific fact and have taken it into account when publishing cold tire pressure requirements
AND
I bet they have done all sorts of measurements and stres tests on the tires taking into account lots of variables

For me....I check pressure in the AM.....very, very occassionally I have to add some premium 78% nitrogen blend....this has worked for the last 30 or so years of motorcycling

The OP lives in Las Vegas. He ain't gonna see 68 degrees for a few more months. So, I'm sure he just wanted to know how to check his pressure when "cold" is 90 degrees.

 

Goodness.....some on this forum really like to worry about things they needn't worry about....nonetheless for the record:

Universal gas law

PV = nRt

pressure x volume = number of moles of gas x gas constant x temperature

R = 8.314 joules per degree Kelvin
T is absolute temperature (degrees Kelvin)

As temperature increases so does pressure at constant volume....the more gas the higher the pressure (WOW!)....I am guessing that the tire manufacturers are aware of this amazing scientific fact and have taken it into account when publishing cold tire pressure requirements
AND
I bet they have done all sorts of measurements and stres tests on the tires taking into account lots of variables

For me....I check pressure in the AM.....very, very occassionally I have to add some premium 78% nitrogen blend....this has worked for the last 30 or so years of motorcycling

But the question is, what pressure do you set it to? Do you set it at the actual pressure the manual tells you, or do you adjust for ambient temperature?

 

But the question is, what pressure do you set it to? Do you set it at the actual pressure the manual tells you, or do you adjust for ambient temperature?

Adjust for actual ambient cold (before running) temperature . 1 psi per 10 degrees F up or down from 68 degrees F (98 degrees ambient before running = plus three psi over your normal cold psi). Then don't touch it all day.

 

Adjust for actual ambient cold (before running) temperature . 1 psi per 10 degrees F up or down from 68 degrees F (98 degrees ambient before running = plus three psi over your normal cold psi). Then don't touch it all day.

I read all that above, I was trying to get his thoughts as he seemed to simplify it so much.

I've been driving for well over 40 years (as have most of us on this forum!). I have never once read an owners manual that told me to adjust for temperature. The entire concept seems awfully strange to me because pressure is pressure in my simple mind (yeah, I'm ready for the shots I'll take for that). I get that heat effects pressure, but isn't pressure the end game? If my trusty tire gauge tells me I have 41 lbs in a tire, why does it matter how it got to 41?

I currently own a BMW motorcycle with a temperature corrected pressure readout from the factory, and I had a Concours 14 that had same. So I'm willing on believing there is something to it. But it sure seems like a bizarre concept to me. I would have to put 45 lbs in my BMW rear tire right now to get the dash readout to show 41. I just am not comfortable putting 45 lbs in my tires when I leave in the morning just to make the readout on my dash happy.

I know what some of you are going to want to say - please understand that I agree it may be the right think to do. That doesn't change the fact that it does not sit well with me.