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Tire pressure

Yahoo Message Number: 109188
I've asked this question at a few rallies never really got an answer. We are in Tucson, ready to hit the road tomorrow. Checked my tire pressure and set 105 psi in the duals and 110 psi in the steer tires. Ambient temp was around 50 F tires were probably colder. Checked the outside dual on the sunny side at around noon and it was 115 F and the outside on the shady side was 110 F Ambient temp at noon was around 80 F I'm sure the tires on the sunny side were hotter. What should I do? Talked to Toyo and basically got a "pre-recorded" instruction from The CS person but not sure they really know. Been there before and my tires still work but wondering what other folks do.

Judy n Joe

98 Intrigue 10578

Re: Tire pressure

Reply #1 –
Yahoo Message Number: 109189
Do about what? Don't understand what the issue is. If tire pressure than measurement is always cold never adjust during the day or when hot.

The sun will heat and change the pressure, along with ambent temp, altitude and just rolling down the highway.

Re: Tire pressure

Reply #2 –
Yahoo Message Number: 109190
I agree with Ray. If your tires are at the desired PSI at a round 70F (they go up/down about 2 PSI per 1oF change up/down, then return when they cool, etc.) let them be.

Tomorrow AM they'll be right back where you started.

Lee (leozbrowski@...) VP Publications, CCI

2007 Country Coach Intrigue 12153
CAT C-13

Re: Tire pressure

Reply #3 –
Yahoo Message Number: 109191
Just set it at proper level in the morning when cold and forget about it. They will vary during the day, no problem. I have found during the day while driving, they go up about 10%. However the only pressure that matters is cold, in the morning, before driving it.

Greg

06 Magna 6642

From: Country-Coach-Owners@yahoogroups.com [mailto:Country-Coach-Owners@yahoogroups.com] Sent: Thursday, December 15, 2016 12:22 PM To: Country-Coach-Owners@yahoogroups.com Subject: [Country-Coach-Owners] Tire pressure

I've asked this question at a few rallies never really got an answer. We are in Tucson, ready to hit the road tomorrow. Checked my tire pressure and set 105 psi in the duals and 110 psi in the steer tires. Ambient temp was around 50 F tires were probably colder. Checked the outside dual on the sunny side at around noon and it was 115 F and the outside on the shady side was 110 F Ambient temp at noon was around 80 F I'm sure the tires on the sunny side were hotter. What should I do? Talked to Toyo and basically got a "pre-recorded" instruction from The CS person but not sure they really know. Been there before and my tires still work but wondering what other folks do.

Judy n Joe

98 Intrigue 10578
2006 Magna Rembrandt C13
2016 Jeep GC toad

Re: Tire pressure

Reply #5 –
Yahoo Message Number: 109193
That's what Ive been doing for about 18 years. My point was If I get up early vs getting up late the "cold" tire pressure could vary by 10+ pounds. I've done the calc using the "ideal gas law". One afternoon (coach stationary) The tire on the sunny side was too hot to touch and the shady side comfortable. Didn't measure the sidewall temp (but could). Didn't measure the pressure either. Maybe I've got too much time on my hands if I'm wondering about this. Actually I don't hitting the road tomorrow and had a few minutes.

Judy n Joe

98 Intrigue 10578

Re: Tire pressure

Reply #6 –
Yahoo Message Number: 109194
Pressurize your tires in the morning before the sun has a chance to heat up the tire. Heat increases the tire pressure. Usually the sun is on one side of the coach and the pressure on that side will be higher than the other. Also altitude affects tire pressure.

In the spring, l'll set the tire pressure in Tucson and 2 weeks later, I will have lost 5 psi by the time I get to Portland, OR., lower temp and altitude. As Result l'll air up the tires 2-5 psi higher than normal.

Hope this helps.

John Beach

06 Allure 31309

Re: Tire pressure

Reply #7 –
Yahoo Message Number: 109195
Have departed more than once when the air temp was below zero! Always taken it slow at first for 5-10 miles, give the tire a chance to start warming up.

Lee (leozbrowski@...) VP Publications, CCI

2007 Country Coach Intrigue 12153
CAT C-13

Re: Tire pressure

Reply #8 –
Yahoo Message Number: 109196
Check them once in the morning when it is cool, before the sun gets them, then leave them alone.

Mikee

Re: Tire pressure

Reply #9 –
Yahoo Message Number: 109197
Tire manufacturers assume the temp is 69 deg F when they recommend tire pressures. I have noticed over the years that when temps get below 45degrees the pressures really drop from the 69 deg reading. Normally what I do is measure one side of the coach in the shade in mid morning and then read the other side in mid to late afternoon at the same temp while I do my make ready and loading the coach. I have smart tire so another option when I get ready to travel is watch the tire pressures on the display as I first leave the RV park or home watching the temps and when they reach 70 degrees note the pressure of each tire as the temps come up. The advantage to Smart tire is if the pressure drops below a set level of pressure you choose you get a warning on the display. After seeing and hearing about so many tire issues over the years I wouldn't want to travel with out some sort of warning system. TWI 2004 Intrigue 11731