Get Ready for It! - Yet Another Tire Pressure Thread!

[seakayaker]

The horse is still kicking...let's continue beating...

I've got new Endurance tires.

* max pressure listed on the tire is 65psi
* max pressure listed on sticker on camper is 50psi
* on the advice of the tire dealer I inflated tires to 60psi
* on the advice of TST Trucking I set the hi pressure alarm on my TPMS to 74psi.
* TT seems to pull fine. No issues with handling, etc.


Questions:

1) Is 60psi an appropriate pressure to inflate to based on the above?
2) I took a short trip yesterday (about 35 miles) and the outside temperature was in the mid-sixties. Tire pressure on the tires rose to about 68psi. Should I be concerned? Is 74psi high enough for the high alarm? Seems that in summertime (mid 90's temperatures) pressure may quickly approach very near or perhaps exceed the 74psi mark.

[Iwannacamp]

Memory tells me to set your alarm pressure at approximately 20% above your normal max inflation pressure.

I will try to find the info...

[Iwannacamp]

Yep. I looked it up.... tireman9 said 15-20%

[DougW]

Did the tires heat up while towing? I suspect if the pressure increased they did get warm as heat is what causes the increase in pressure. If so bring them up to max cold pressure.

Did the trailer follow along nice and smooth or does wobble a bit and seem to be wallowing? If it wobbles or wallows, add air to the tires.

[lbrjet]

I would change it to 78 in case you want to put 65 in. Leave yourself some leeway. Running 60 psi is fine and an 8 degree pressure rise is fine as well. Over time you will find no two trips produce the exact same results. You may rise 5 and you may rise 10. Too many variables to predict.

[Ronjon50]

Same here, just got new endurance this week, old China bombs called for 50 max cold.... Tire man said he put 60 in Goodyear’s.... I will be following comments!

[llr]

Get your loaded axle weight then use the load/inflation pressure chart.

[Tom48]

Originally Posted by Ronjon50

Same here, just got new endurance this week, old China bombs called for 50 max cold.... Tire man said he put 60 in Goodyear’s.... I will be following comments!

50 psi recommend on trailer means you started with load range C tires. On those I would always start with cold pressure at full 50.

On our old rig, when I went up to LR D I stayed at the full 65 psi rated cold. When we took those to LR E I backed off from the 80 psi max to about 72. As long as I kept pressure up they both D and E Ran out great.

New rig is LR D China bombs and I vowed replace them immediately, BUT THEN GOT CHEAP and decided to run them until I start to see sign of wear. We always keep pressures up, tpms on and keep the sidewalls off of curbs. I walk around with laser temp gun at every stop checking tire, rim and hub temps. So far all well. FR and others seem to have put this particular brand in to wide circulation and I've only seen a limited number of complains by brand, but I will be more at ease when I move up to LR Es probably this summer.

About the temp and pressure spread. I had big pressure swing on one trip but then realized that I set pressure on Tuesday night during a cold cold night. Weather had warmed up before we left Thursday. That made a big difference. Now I set tire pressure at outside air temp nearer to what I expect it to be when I roll out.

Never was this particular until I realized after two blow outs on old tt how sensitive tire pressure can really be. Since then, I am a hawk about it on all of our vehicles and trailers, even the little utility trailer and asside from a couple slow leaks from nails that I caught right away.

Knock on wood. Have not blown a tire on anytihing ever since I started being careful.

[Tom48]

Originally Posted by llr

Get your loaded axle weight then use the load/inflation pressure chart.

Within limits I always opt for higher pressure than the charts recommend. Higher pressure equals lower temp and less rolling resistance so better milage.

Most passenger vehicles suggest 32 psi. The tires I run are rated cold for 40 or 44 psi. I run 40 and get better milage and great tire wear/milage.

And never never run around with a low tire.

[EdnKat]

Originally Posted by seakayaker

The horse is still kicking...let's continue beating...

I've got new Endurance tires.

* max pressure listed on the tire is 65psi
* max pressure listed on sticker on camper is 50psi
* on the advice of the tire dealer I inflated tires to 60psi
* on the advice of TST Trucking I set the hi pressure alarm on my TPMS to 74psi.
* TT seems to pull fine. No issues with handling, etc.


Questions:

1) Is 60psi an appropriate pressure to inflate to based on the above?
2) I took a short trip yesterday (about 35 miles) and the outside temperature was in the mid-sixties. Tire pressure on the tires rose to about 68psi. Should I be concerned? Is 74psi high enough for the high alarm? Seems that in summertime (mid 90's temperatures) pressure may quickly approach very near or perhaps exceed the 74psi mark.

Put 65 in them and go. They roll and pull easier, and heat less.
Happy, trouble free, trails.

[Mad Cow]

The only issue with running more pressure than is appropriate, part of what tires are designed for is to absorb road shock. If the tires are overinflated for the actual load on them, the will not flex as well and more of that road shock is transferred to the trailer. Maybe not a big deal short term, but it could make a significant difference long term.

This is one of the reasons we have pneumatic tires and not solid tires.

[EdnKat]

Originally Posted by Mad Cow

The only issue with running more pressure than is appropriate, part of what tires are designed for is to absorb road shock. If the tires are overinflated for the actual load on them, the will not flex as well and more of that road shock is transferred to the trailer. Maybe not a big deal short term, but it could make a significant difference long term.

This is one of the reasons we have pneumatic tires and not solid tires.

The reason for 2 ply side walls, to absorb that shock. Run max psi 40 years, not any probs, except GY Marathons, not enough tire for the Sanibel 3500, replaced with Sailun Gs.

[kurtsont]

Just FYI I too have the Endurance and had C rated tires and went up to the D. Called Goodyear and the tech told me run them at 50psi.

[Cujo7240]

Originally Posted by seakayaker

The horse is still kicking...let's continue beating...

I've got new Endurance tires.

* max pressure listed on the tire is 65psi
* max pressure listed on sticker on camper is 50psi
* on the advice of the tire dealer I inflated tires to 60psi
* on the advice of TST Trucking I set the hi pressure alarm on my TPMS to 74psi.
* TT seems to pull fine. No issues with handling, etc.


Questions:

1) Is 60psi an appropriate pressure to inflate to based on the above?
2) I took a short trip yesterday (about 35 miles) and the outside temperature was in the mid-sixties. Tire pressure on the tires rose to about 68psi. Should I be concerned? Is 74psi high enough for the high alarm? Seems that in summertime (mid 90's temperatures) pressure may quickly approach very near or perhaps exceed the 74psi mark.

To get the max load carring capacity of your new tires, set your pressure at the rated max pressure of 65psi stated on the tire. Don't worry that the pressure will go above 65 while you are driving the tire manufacture took that into consideration when they set the max pressure limit. Just make sure the tires are cold when you inflate them to the max pressure rating.

[Murbella7]

A tire properly inflated to its cold temp pressure (in this case 60psi) with an appropriate load on an average temperature (warm) day, will increase in pressure by about 4-5 psi, with a little increase in temperature 1-3 degrees).

If your trailer does not overload the tire and after running for an hour or two, the pressure and temp changes to about what I said, all should be well. I am pretty sure the max pressure rating is for a cold tire.

An under-inflated tire will increase to a higher pressure and more quickly, and the temp of the tire will also increase quicker. Set the monitor as suggested here and have your navigator (oh that is a dangerous word) keep checking, don't wait for the alarm.

[rsdata]

I also have Endurance D rated up from china bombs C rated at 50PSI...

I chose 57 PSI for recent 1700 mile trip... tire went to 67-68 PSI while driving and about 10-12 degrees over ambient outside temp... I think all went just fine and will continue to air up to 57 with my 4800# two axle trailer... If your trailer is heavier then maybe 60 PSI is the right number.

The load range C tires were the minimum tire FR needed to be legal... upping a load range I believe gives you a bit safer tire with more road-hazard (pot holes and curb strike) resistance.

[card16]

Just as a point of clarification, many of you are talking 65psi for your Endurance tires, but, (and perhaps I missed it), this rating is for the St205/75R14 and other 14" tire sizes. Some 15" tires and the 16" sizes, such as my ST235/80R16, 'E' rating, have a max inflation pressure of 80psi.

[rsdata]

I believe C rated =50 PSI
D rate = 65 PSI
E rated = 80 PSI no matter what the size of tires...

[moose074]

Just pulled this chart for an earlier thread

[Murbella7]

Originally Posted by rsdata

I also have Endurance D rated up from china bombs C rated at 50PSI...

I chose 57 PSI for recent 1700 mile trip... tire went to 67-68 PSI while driving and about 10-12 degrees over ambient outside temp... I think all went just fine and will continue to air up to 57 with my 4800# two axle trailer... If your trailer is heavier then maybe 60 PSI is the right number.

The load range C tires were the minimum tire FR needed to be legal... upping a load range I believe gives you a bit safer tire with more road-hazard (pot holes and curb strike) resistance.

Agree