tire pressure

[loafercarnut]

Any advice on the correct tire pressure for Yokohama Geolandar H/t-5 Lt 215/75/R15. The tag on the door says 100 lbs. No way! Much appreicate the help. Thank you Craig

[bigdan]

tag on door ????


On any Rilata`s that Ive seen it never shows over 65 lbs .....this is what I put 60-65 lbs



100lbs ,,,,,you sure ???



Dan

[ManWonder]

here's what I'm wondering... where do you go to inflate your rear tires? mine call for 80 PSI but the local gas station's pay pump only goes up to 70

[booster]

Originally Posted by ManWonder

here's what I'm wondering... where do you go to inflate your rear tires? mine call for 80 PSI but the local gas station's pay pump only goes up to 70

You have a Chevy, IIRC, so most of us have found that 80 psi rear and 65 psi front will give the best balance of handling vs comfort. There are those that like other pressures, but the 80/65 is by far the most popular.

[rtsukijima]

You might be looking at load rating.
Our Rialta has a 104 front and 109 rear load rating. The tires must meet or exceed the load rating that the RV has specified or it will be unsafe. Our sticker says 60 psi f/r.

[mkguitar]

I generally do my tire fills at costco.

I have a compressor at home, but I buy my tires at costco which includes services and i am usually at costco in prep for a trip.

Mike

[BBQ]

.

Some shops provide nitrogen tire fills. The gas does not expand in hot temp.

[avanti]

Originally Posted by BBQ

.Some shops provide nitrogen tire fills. The gas does not expand in hot temp.

Well, not exactly. ALL gasses expand with temperature. Pure nitrogen helps some in this regard, not because it is nitrogen, but because it is DRY (i.e., does not contain water vapor).

There are other advantages to nitrogen in tires, but they are minimal:

Should You Fill Your Car's Tires With Nitrogen?

[mkguitar]

if we are going to get into it- my personal experience:

larger nitrogen molecules are slower to migrate thru rubber- psi while parked/stored will remain more stable

nitrogen does not expand as much as air due to temp changes ( which is why race cars and aircraft use nitrogen) and less affected by changes in air pressure due to elevation.

these changes can be enough to affect handling on some vehicles.

since I use costco- it costs me nothing



Mike

[booster]

Originally Posted by mkguitar

if we are going to get into it- my personal experience:

larger nitrogen molecules are slower to migrate thru rubber- psi while parked/stored will remain more stable

nitrogen does not expand as much as air due to temp changes ( which is why race cars and aircraft use nitrogen) and less affected by changes in air pressure due to elevation.

these changes can be enough to affect handling on some vehicles.

since I use costco- it costs me nothing

Mike

Larger molecules is true so some tires will lose a bit less over time. Some tires aren't affected by it much. Our Michelins (3 vehicles) don't lose much at all. My big old Roadmaster sits all winter and barely loses 1.2 psi.

All gasses expand at the same rate with temperature, it is if there is moisture in the gas that makes a difference. Nitrogen gas is moisture free, so that is where the gain comes in. Elevation should make no difference per the ideal gas law.

[avanti]

Originally Posted by booster

All gasses expand at the same rate with temperature, it is if there is moisture in the gas that makes a difference. Nitrogen gas is moisture free, so that is where the gain comes in. Elevation should make no difference per the ideal gas law.

Correct. Dry air (if you could find it) would be almost as good as dry nitrogen.

Many have pointed out that if the "larger molecules" story were significant, the leaking tires would selectively filter by molecule type -- allowing the oxygen to leak while tending to retain nitrogen. Over time, you would end up with mostly nitrogen even if you started with air! Don't count on it.

I agree that if you can get nitrogen for free, there is no downside.