Tire pressure and temperature recommendations

[beaubeau]

Been a looooong time since we have had a trip to take, and now it's upon us!
I can't remember what I last decided about tire pressure.
We have a 2008 Allegro QDB. It's got 4 tires on 1 axle in the back.

I have all 6 tires set at 95PSI. How does that sound?

Also, I have installed a TPMS which monitors temperature.

What is a too-high tire temperature?

Thanks!

[JaxDad]

It’s my understanding that the temperature feature is not intended to warn you about high temps per se but rather to give you the second part of the needed equation to give you a better understanding of the pressure readings.

As the tires heat up the pressure goes up also. Without knowing the temperature a pressure reading while rolling down the highway after a few hours of driving of very hard to relate to ‘cold’ readings.

[Executive45]

beaubeau wrote:
First leg of trip is done. Had 10 miles of interstate, so no chance to get weighed. The plate in the cockpit says 95 for rear and 105 for front. So that’s what I went with.
By the time we got here, they were all around 118.
Does that sound okay?

105 to 118 is about right. Temps will increase depending on road conditions, air temp and your speed. 10-15PSI increase is ok....Dennis

[wolfe10]

beaubeau wrote:
First leg of trip is done. Had 10 miles of interstate, so no chance to get weighed. The plate in the cockpit says 95 for rear and 105 for front. So that’s what I went with.
By the time we got here, they were all around 118.
Does that sound okay?

Until you get it weighed, yes follow posted PSI on the GVWR plaque. Hopefully that will end up being over-inflated, indicating you have some weight safety reserve and actual weight is less than GAWR's.

[beaubeau]

First leg of trip is done. Had 10 miles of interstate, so no chance to get weighed. The plate in the cockpit says 95 for rear and 105 for front. So that’s what I went with.
By the time we got here, they were all around 118.
Does that sound okay?

[wolfe10]

olfarmer wrote:
I run what the MH manufacturer recommends on the VIN/GVWR tag. Have never had a problem. I have had each axle weighed and that had the same result for the pressure recommended.

Good advice IF (yes, the bad) you are near the GAWR's for your coach.

Said another way, if you are well under GAWR's/have a healthy weight safety reserve, you are over-inflated.

[olfarmer]

I run what the MH manufacturer recommends on the VIN/GVWR tag. Have never had a problem. I have had each axle weighed and that had the same result for the pressure recommended.

[wolfe10]

JRscooby wrote:
Remember if you have been driving, pull in to weigh your snot, and adjust the pressure, next morning, when your tires are the same temp as outside air, you are setting on underinflated tires. Within a hour you might be setting alongside the road

Correct!

Proper order is:

Get weight ticket

From your tire manufacturer's Inflation Table, determine proper minimum PSI based on axle weights. Add 10-15% as a safety cushion-- perhaps 15-20%, as you need to account for left/right imbalance.

ONLY adjust PSI before driving more than a mile or two and better in the morning (after sitting overnight) as ambient temperatures are lower and you need to be able to have correct PSI when you start out in the morning.

[JRscooby]

Remember if you have been driving, pull in to weigh your snot, and adjust the pressure, next morning, when your tires are the same temp as outside air, you are setting on underinflated tires. Within a hour you might be setting alongside the road

[beaubeau]

Thanks for the help! This trip does have a dozen or so miles on an interstate so I’ll be looking for a scale.

[Executive45]

Any Pilot/Flying J will have a scale. DON'T BE INTIMIDATED! THEY ARE THERE AND WILL HELP YOU! Pull onto the scale, placing each axle on each scale. Put it in neutral and release the parking brake. There is a microphone to talk to the cashier. Tell them you're an RV and want a weight ticket. They will tell you when they are through. Takes about 30 seconds. Pull off the scale and go inside for your weight ticket. Adjust your tire pressure as per mfg recommendations.....four corner weighing is best but it's more expensive and harder to find someone who will do it. Axle weighing is next best and will give you enough info to properly air your tires. Altitude and temperature will also affect PSI in your tires so adjust for that if traveling. I set my PSI twice a year (summer and winter) and rely on my TPMS while traveling.....Dennis

[JRscooby]

beaubeau wrote:
Thanks everyone. I don’t see a way to get it weighed before I drive it, but the idea makes me want to pull into a scale pretty quickly.

Have bought tires for millions of miles. Over inflated will make it ride rough. And might have a little affect on handling. Under inflated will ruin a tire in a short distance.
Assuming you have a good compressor I would air up to max sidewall, stop by Cat on your way first day. Then after tires cool, and before next travel day adjust to chart.

[beaubeau]

Thanks everyone. I don’t see a way to get it weighed before I drive it, but the idea makes me want to pull into a scale pretty quickly.

[way2roll]

Ed C wrote:
You need to know the weight...at each corner or at least each axle. Then you can check the tire manufacture's chart for those weights. If the tire pressures are right the temperature doesn't matter unless it changes drastically

I would add that it needs weighed while loaded for travel.

[FloridaRosebud]

My MH weighs 19,000 lbs loaded, and I run 80psi in the front and 85psi in the rears. Based on both the Toyo and Michelin tire tables and the true weight of the MH.

Al