Community Forums

seahawkiii · 04-26-2020, 11:45 AM

Hi all - before you roll your eyes with an old questions - here is mine....

We will be departing Tucson back to Washington state in a few days so today I started the walk around and checked tire air pressures. It is presently 88 degrees and the side I checked was on the shady side. What I noticed was that each of the tires was almost exactly 10 pounds higher than when I left the house in late December and the temps were low 40s.

So my questions are: Is the temp change enough to raise the temp 10 degrees? and Since I'll be returning to cooler temps should I leave the tires where they are or return them to the original pressure and re-inflate to the correct temps when we are in cooler temps?

I'd appreciate your thoughts - - oh - original pressures were 110 front, 80 mains, 75 tag.

John

Mwoodofd · 04-26-2020, 12:33 PM

I would adjust them to the correct pressure before you depart. Yes, 10 lbs can seen from cold temps to warmer temps when checked in the morning. You would want to check each morning and adjust accordingly. Check the tires in the morning, preferable before the sun hits them (or one side)

I just let out about 8 lbs here in the Dallas area from temp changes, and will have to let some more out as we heat up.

Kahoona · 04-26-2020, 12:34 PM

Quote:

Originally Posted by seahawkiii

Hi all - before you roll your eyes with an old questions - here is mine....

We will be departing Tucson back to Washington state in a few days so today I started the walk around and checked tire air pressures. It is presently 88 degrees and the side I checked was on the shady side. What I noticed was that each of the tires was almost exactly 10 pounds higher than when I left the house in late December and the temps were low 40s.

So my questions are: Is the temp change enough to raise the temp 10 degrees? and Since I'll be returning to cooler temps should I leave the tires where they are or return them to the original pressure and re-inflate to the correct temps when we are in cooler temps?

I'd appreciate your thoughts - - oh - original pressures were 110 front, 80 mains, 75 tag.

John

A number of things change the pressure. Mine vary too. When they are higher I leave them there because I know they will go down. Temperature makes a difference but that is quite a bit. Tuscon is at close to 4,000' altitude is it not? If you live at a lower altitude that may increase the pressure. I know that, over time they will go down also so I just leave them be.

The one case where I will readjust down is when the RV has been serviced. Service people will sometimes add more air then called for on the tire manufacturer's specs. This is so that they are sure that no damage will be done from over-inflation.

Rollin101 · 04-26-2020, 01:38 PM

If they were correct when you left Wa. leave them alone. They will be back to same pressure you had when you get back. The difference in temp will definitely increase the pressure.

yeloduster · 04-27-2020, 07:18 AM

Expect about 1 PSI per 10° F. Bigger tires change more than little tires. Tire pressure also will change about .5 PSI per 1000 ft of elevation change. Check tire pressure in the morning before the sun starts shining on them.

I live at 7000 ft and my climate is typically cooler than most. I set my pressure at home in the morning according to a load inflation table. I don't worry about pressure changes due to temperature or elevation. As I travel I check to make sure that all tires have the same pressure when cold ±2°. If they do, I'm good to go.

Over the road truckers may go from 0° F to 100° F and elevation changes of 10000 ft in a 24 hour period. They check their tire pressure once a day...if that often.

I'm not as OCD about this as some. I've LOTS of miles RVing and have avoided tire issues!

seahawkiii · 04-27-2020, 11:34 AM

Thank you all for the advice. All of my pressures are consistent with no anomalies so I'm going to go as is and keep an eye on the monitors. I've never paid that much attention to this but we've sat for 4 months....in hindsight I've probably been lucky.

John

buck58 · 08-11-2020, 05:18 PM

Is it normal for tire pressure to increase about 20 pounds while you’re driving? My steer tires should be set at 120....I am heading south, but I see Pressures at 140 as I’m driving all day seems like a lot of increased to me? Thanks for your help in advance✝️[emoji120]

twinboat · 08-11-2020, 06:06 PM

Quote:

Originally Posted by buck58

Is it normal for tire pressure to increase about 20 pounds while you’re driving? My steer tires should be set at 120....I am heading south, but I see Pressures at 140 as I’m driving all day seems like a lot of increased to me? Thanks for your help in advance[emoji3583][emoji120]

Yup, normal.

Rollin101 · 08-12-2020, 11:48 AM

Quote:

Originally Posted by buck58

Is it normal for tire pressure to increase about 20 pounds while you’re driving? My steer tires should be set at 120....I am heading south, but I see Pressures at 140 as I’m driving all day seems like a lot of increased to me? Thanks for your help in advance✝️[emoji120]

As twinboat said: normal, especially for the steer tires.