Trailer tire pressure

[mudman2]

I've got a 2015 t19qbhw with 13" tires, I believe it says max pressure 65lbs. Should I be running that on the road? I checked the pressure and its reading 45 lbs now. I've made some 200 mile trips at 70-75 and it appears fine.
Thanks in advance

[Ford Idaho]

What is says on the sidewall cold, do not lower when hot.

[mudman2]

Originally Posted by Ford Idaho

What is says on the sidewall cold, do not lower when hot.

It says 45 to 65.

[Ford Idaho]

What brand are they and what is the specific size.

[mudman2]

Originally Posted by Ford Idaho

What brand are they and what is the specific size.

Westlake super st st185/80r13

[OldCoot]

IMO, I see 2 things wrong, 1) Running 70-75 mph on tires with a max speed of 65. 2) Running tires with a Max cold pressure of 65# @ 45#.

FWIW, I've never seen a tire with 2 Max tire pressures stamped on a sidewall.

[mudman2]

Originally Posted by OldCoot

IMO, I see 2 things wrong, 1) Running 70-75 mph on tires with a max speed of 65. 2) Running tires with a Max cold pressure of 65# @ 45#.

FWIW, I've never seen a tire with 2 Max tire pressures stamped on a sidewall.

I guess I'll keep it at 65 mph
Thanks

[handbuilder]

We keep our 14" A-Frame tires at 50 psi. We travel alot of passes and the dealer said many visiting rvers over look the driving/road variables and the dealer said they replace many a blow out because the rv tires had maximum air in them.

[Pooneil]

Goodyear has a chart that give weight rating and pressure recommendations for their trailer tires. http://www.goodyearrvtires.com/pdfs/rv_inflation.pdf

The chart shows the weight rating of the tires goes lower with the pressure. Tires that can be inflated to 65 PSI have a 300# to 400# lower weight rating at 50 psi.

That reduction in capacity with pressure may not be the case for all manufactures, but I see no reason to believe it wouldn't, with out a something directly from the specific manufacturer.

I cannot see any reason to run at less than the manufactures maximum recommended inflation.

[Evereddie]

Originally Posted by handbuilder

We keep our 14" A-Frame tires at 50 psi. We travel alot of passes and the dealer said many visiting rvers over look the driving/road variables and the dealer said they replace many a blow out because the rv tires had maximum air in them.

There is something wrong with that dealers statement.

[Pooneil]

Originally Posted by mudman2

I've got a 2015 t19qbhw with 13" tires, I believe it says max pressure 65lbs. Should I be running that on the road? I checked the pressure and its reading 45 lbs now. I've made some 200 mile trips at 70-75 and it appears fine.
Thanks in advance

The problem, as I understand it is damage from sidewall flexing. This can be from heat but also excesses bending. So I am with in keeping them at 65psi.

[acadianbob]

Originally Posted by Evereddie

There is something wrong with that dealers statement.

X2. The WORST that could happen with max inflation is that the tires wear in the center.

[handbuilder]

The sticker recommends 50 psi cold tire

Keep in mind where I bought my trailer was at the bottom of the pass. High elevation to get back home. Not the first time I heard about air and high altitude/elevation and blow outs - my spouse and rv traveling peers have too. Dealer confirmed it and said he makes recommendation but there is a fair amount of naysayers. His service center gets the repair, so I dont think he cares one way or another if people believed him or not. Atmospheric pressure and temps will definitely affect the tires in my region. I look at it much like my experience with the surge protector...some people will do it or not. I've had bags of chips pop while traveling, that tiny observation is enough for me. Haha

[vinmaker]

Everything I have ever heard or read says to run trailer tires at the maximum psi. As was stated earlier, you lose weight capacity when you lower PSI. RV makers generally do not place tires on units that offer lots of capacity over the weight ratings. They tend to run them at their limits and you need full psi to get the full weight ratings.

Vin.

[cdangel0]

Well I think we're missing something on the point here. I completely understand the dealer's opinion of under inflating while at the bottom of the pass due to atmospheric changes. A tire at 50# at the bottom of the pass may be 60# at the top.

BUT if you're measuring your tire pressure at the top then you're at 50#, traveling down the pass may leave you at 40# at the bottom.

I think it would be better to inflate to 65# at the higher altitude and be a little under at lower altitudes, than the other way around. A lot more convenient (but not as safe) as stopping to correct air pressure after significant altitude changes.

[mcnabbwr]

Here is an article which explains tire pressure changes due to altitude. These changes are minimal and I keep my tires at max cold pressure.

http://www.tirerack.com/tires/tirete...jsp?techid=167

[mudman2]

Thank you all for responding. I think I'll go with 55 lbs for the moment.

[Fox58]

Sorry, but the RV dealer doesn't know what he's talking about. At best he's got some anecdotes and is incorrectly drawing cause-and-effect conclusions. The science is as noted in the Tire Rack piece.


The simple truth is tires are at the their maximum load-bearing rating when inflated to the maximum pressure measured "cold". Running lower pressure decreases load carrying capability and increases heat buildup. It also causes increased rolling resistance and thus negatively affects fuel mileage, albeit not likely to a material degree. Lastly, resistance to puncture is largely a matter of friction, so highly inflated tires will be at least somewhat more resistant to puncture failure.


I run mine at the maximum and agree that the worst downside is higher treadwear in the middle. Since most of us must replace trailer tires due to age/dry rot long before tread wear becomes an issue, this means little to me.


Fox58


Fox

[pgandw]

X2

I live at 7600ft. I have always worried about my tires being under-inflated when driving to Nebraska or Texas. Now I see the temperature increase will partially offset the internal pressure decrease. And when going to a much lower altitude, I will over-inflate 2-3 lbs before starting on the trip (both tow vehicle and camper).

I took the need to blow out my sprinkler lines in the fall as my man-card excuse to buy a man-size air compressor for the garage. This also gives me an air supply for checking my tires on a regular basis, as well as an air source for hobby air brushing.

Fred W
2014 Rockwood A122
2008 Hyundai Entourage (minivan)
camping Colorado and adjacent states one weekend at a time

[Pooneil]

Originally Posted by handbuilder

The sticker recommends 50 psi cold tire

If that is how the original tires on your camper are rated, certainly stay with that as the max rated pressure as long as you have those tires.