Tire pressure

NO NO NO, and another DITTO...

Thanks to the original poster for the question, and thanks to members for your responses. Very informative.

Marc

fdwt994 wrote:
Agree with the others. Don't overthink it. The manufacturer knows the pressure will increase as the tire warms up. Set the pressure at cold and you'll be fine.

x3. The temp increase is built into the manufacturer's recommended pressure. Also elevation change.

Set when cold and check when cold. Never bleed off pressure

Agree with the others. Don't overthink it. The manufacturer knows the pressure will increase as the tire warms up. Set the pressure at cold and you'll be fine.

garyemunson wrote:
Set tire pressure when unit has been sitting and tire are not hot. DO NOT EVER 'bleed off' air as this can lead to underinflated tires once they cool back down. Elevated pressure from tires getting hot is NEVER a problem and actually helps keep the tire from getting even hotter by minimizing flexing of the rubber at speed.

Another DITTO

Triple DITTO.

Check and set them at the ambient temp. in the morning before you leave when they've been in shade for at least a few hours. Unless you've been to a scale and have looked up a chart for loading vs. pressure, run them at the sidewall max. psi. If you are significantly changing altitude and outdoor temps. on a leg of a trip, you may need to reduce psi or add some air the next morning. Some will disagree, but if you are on a long trip (in days), it's a good idea to check the pressure on each leg of the trip to see if you have a slow leak in a tire.

If you have ST tires, it's very important to stay below 65 mph, never ever tow on under-inflated tires and make sure the tires aren't overloaded otherwise you can end up with a blowout. Overloading can be from inadequately sized tires by the RV manufacturer, being heavier on one side due to a slide and/or by having one or more full holding tanks. One of the best things you can do is weight your TT and TV at a scale so you know the actual tongue wt. and actual total wt. of the trailer.

A good digital pressure gauge is a good tool to have and a TPMS is also a good idea if you plan to travel around much.

David....tire makers know their tires will grow pressure from heat caused by rolling and carrying a load.
I've seen my 16" LT E tires set cold at 80 psi grow to 92-94 psi after several hours at interstate speed and a heavy load.

As has been said tire makers don't recommend letting air out of a hot tire. If I had let 12-14 psi out of my hot tires and stopped for a fuel/lunch break they would be cooled and 12-14 psi low and really get hot to the point of tread/belt separation issues.

What they said.

DITTO DITTO