Community Forums

jimbo2013 · 12-20-2015, 06:28 AM

I set my tires cold in FL outside temp about 70

Rear 85 front 100

Got to Va parked overnite Rear 72 front 88

driving a few miles the pressure went up

Now in NY outside temp 36 still Rear 72 front 88 parked

Before I head back south should I air up in the cold temps or leave it alone.

If I air up now won't the pressure be too high heading south?

Interesting, if didn't have a Pressure Pro system I would not have known

.

palehorse89 · 12-20-2015, 06:33 AM

If I were you, I would quit thinking of chasing tire pressure's in temperature changes and chase the grand kids around the Christmas tree

Your tires will be fine.........unless you are loosing air.

Noworkforme · 12-20-2015, 08:00 AM

Yes, I think you should air up, and then you will have to air down as you go south again. I travel from north to south, and back, frequently, and watch my tires fairly closely. I like to keep my tires fully aired to max pressure (on the trailer) and recommended rating for the truck. The closer your vehicle weight to your max rating, then the more important this is.

I air up or down as needed, but it isn't usually more than once per trip as I am okay being plus or minus a couple pounds. I think your current pressures are sufficiently outside of where they should be that you add air.

Gary RVRoamer · 12-20-2015, 08:29 AM

If your psi was set for the exact amount needed for the load, then yes you should adjust the pressure whenever you will drive at a substantially different ambient temperature. However, you can avoid frequent adjustments by simply making your normal pressure about 10 psi greater than the minimums for your vehicle weight. Tire psi changes about 2% for every 10 degrees of temperature change, so an extra 10 psi in a 100 psi tire gives you enough to accommodate a 50 degree temperature swing. That should readily handle daytime differences from FL to NY.

If you are going to be spending weeks or months in a location with lower or higher average temps, it is worthwhile adjusting. Otherwise, the 10 psi extra covers you nicely.

I think, though, that one of your measurements was wrong, or was affected by something else. The 13 psi delta from Fl to VA doesn't seem credible unless it was around zero that morning in VA. And the fact that it did not change further when you checked in NY also suggests an error somewhere.

jimbo2013 · 12-20-2015, 08:48 AM

Gary, yes I could be off a few lbs, from guessing.

In fact in Va it may have been 28 + wind

Helipilot · 12-20-2015, 09:07 PM

I check mine before I launch for each day of travel. Air them up or down to recommended pressures regardless of OAT (Outside Air Temperature).

Ray,IN · 12-20-2015, 09:18 PM

Always set tire pressure to the mfgrs. tire placard in the RV, that way you are safe wherever you travel. BTW, that's what the tire industry recommends too.

jimbo2013 · 12-20-2015, 09:47 PM

Quote:

Originally Posted by Ray,IN

Always set tire pressure to the mfgrs. tire placard in the RV, that way you are safe wherever you travel. BTW, that's what the tire industry recommends too.

Maybe but I rather go by my 4 corner weights

firedoc · 12-20-2015, 10:04 PM

Quote:

Originally Posted by Ray,IN

Always set tire pressure to the mfgrs. tire placard in the RV, that way you are safe wherever you travel. BTW, that's what the tire industry recommends too.

Actually I think they recommend setting weights according to tire size and corner weights of rig. That is why they supply tire inflation charts.

Sent from my iPhone using iRV2 - RV Forum

Old-Biscuit · 12-21-2015, 01:26 AM

Quote:

Originally Posted by Helipilot

I check mine before I launch for each day of travel. Air them up or down to recommended pressures regardless of OAT (Outside Air Temperature).

Ding ding ding.......winner chicken dinner

Tires are to be aired (adjusted up/down) when cold for travel ie: first thing in morning prior to driving

Pressures should be according to vehicle safety data sticker, COLD MAX PSI on sidewall OR by weight load charts

ChallengerRN · 12-21-2015, 05:57 AM

Make sure to add nitrogen to stabilize your pressures. !!

Russell

Romer1 · 12-21-2015, 06:11 AM

Just curious, with all these discussions on tire pressures, how many of you do the same checks to your car tires every day? If not, why not?

JC2 · 12-21-2015, 06:52 AM

I'm curious but of the many past threads on this and other forums concerning the correct tire pressure for a mh, there usually is quite a difference between front and rear pressure. Why? We run our fronts 5+- higher than our rears; 110psi fr-105psi rear.

Steve Ownby · 12-21-2015, 07:16 AM

Quote:

Originally Posted by JC2

I'm curious but of the many past threads on this and other forums concerning the correct tire pressure for a mh, there usually is quite a difference between front and rear pressure. Why? We run our fronts 5+- higher than our rears; 110psi fr-105psi rear.

Tire pressure is all about weight supported by that tire position. It's definitely not a one size fits all answer. If you have never had your coach weighed at each corner then the safest pressure is to use the GAWR for each axle and inflate the tire to carry that weight according to the tire manufacturers inflation chart for your size tire.

There is a lot of chatter on the Newmar forum here about some coaches being very close to the GAWR on the steer axle as designed. The Dutchstar is a pretty heavy coach.