proper tire psi,.transon ties,bow stop??

bruceb58

bruceb58

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oldjeep said:
That only applies to Goodyear tires. I'll hunt them down again if I have to but the mfg of the other major trailer tires says max pressure.
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Laws of physics do not only apply to Goodyear.
 
oldjeep

oldjeep

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bruceb58 said:
Kinda looks like the Goodyear chart that oldjeep was not believing.
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For my trailers, I'll stick to what the trailer manufacturer and tire manufacturer both say to run - 50 (Max PSI)

WP_20140627_002.jpg
 
bruceb58

bruceb58

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Yep...matches the chart!

Of course the label says nothing about what the PSI is for lower loads.

Did you find the recommendation from that major tire manufacturer that says always run max PSI regardless of load?
 
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bruceb58

bruceb58

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oldjeep said:
I'll hunt them down again if I have to but the mfg of the other major trailer tires says max pressure.
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I want to see this!

I agree with the trailer manufacturer. Better to have too much pressure than too little which is what causes most tire failures. It's a good CYA to have a label like that.
 
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bigdee

bigdee

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oldjeep said:
From Carlisle
http://www.carlisletransportationpro..._Practices.pdf Maintain air pressure at the maximum PSI recommended on the tire sidewall.
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I'm with you oldjeep. Here is a quote from another: Your tow vehicle is a leader, which means traction is a key focus in the design of its tires. Traction allows your tow vehicle to accelerate down the road, turn around the corner and brake to a stop. Another important consideration is tow vehicle tires are designed for ride comfort, which is achieved in part by allowing their sidewalls to flex.
>>>>>Your trailer is a follower, which often makes tire sidewall flexing a negative. Sidewall flexing on trailers, especially those with a high center of gravity (enclosed/travel trailers) or that carry heavy loads, is a primary cause of trailer sway. Typical passenger radial tires with flexible sidewalls can accentuate trailer sway problems. The stiffer sidewalls and higher operating pressures common with Special Trailer (ST) designated tires help reduce trailer sway.<<<<<<
Until someone can come up with a solid reason to run less than max (and no one here has) I will use my common sense to follow directions. I have towed for over 50 years and know firsthand the dangers of under inflated trailer tires. Once a trailer starts to sway there is no way to stop it except for slowing down and starting all over again.
 
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bassman284

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This subject has come up about once a month in the 14 years I've been here and pretty much goes the same way every time. I finally quit arguing with people. The folks who like to run low pressure in their trailer tires are going to do it regardless of what anyone here says to them. The same with folks who like to run passenger car tires on their trailers.
 
bruceb58

bruceb58

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I used to be in the camp of always fill to the max PSI but after discovering a few tire manufacturers specifying PSI based on load for various size tires, I have changed my thoughts. If you are going to err, going to max PSI is probably the safest but not an absolute.
 
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bassman284

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Dang. I was so proud of myself for remembering that this year is 2014 that my arithmetic went away.Should have been 12. I joined in the summer of 2002 as bassman283. I had to index the user name in 2006 due to um, er, upgrade issues.
 
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phillyg

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Tire pressure vis-�-vis load is a big deal, especially on the RV forums where I hang out, too. If a tire mfgr. publishes load charts, one should pressurize their tires based on their load. This is the first I've ever heard a tire mfgr. (Carlisle) publicly stating to run at max pressure all the time. If you are running 80lb max pressure tires, and have a double axle trailer (4 tires) and they're rated to carry, for sake of argument, 2000lbs each, then you're load at 80lbs is 8000lbs. But, if your boat and trailer, fully loaded, weighs only 6000lbs, then most load tables will tell you to have only, again for sake of argument, 60lbs. Lastly, your straps should be snug. If you have to use super strength to tighten your straps, its likely the trailer is not properly adjusted for your boat.
 
bigdee

bigdee

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phillyg said:
Tire pressure vis-�-vis load is a big deal, especially on the RV forums where I hang out, too. If a tire mfgr. publishes load charts, one should pressurize their tires based on their load. This is the first I've ever heard a tire mfgr. (Carlisle) publicly stating to run at max pressure all the time. If you are running 80lb max pressure tires, and have a double axle trailer (4 tires) and they're rated to carry, for sake of argument, 2000lbs each, then you're load at 80lbs is 8000lbs. But, if your boat and trailer, fully loaded, weighs only 6000lbs, then most load tables will tell you to have only, again for sake of argument, 60lbs. Lastly, your straps should be snug. If you have to use super strength to tighten your straps, its likely the trailer is not properly adjusted for your boat.
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Whoa! apples and oranges. RV suspensions are engineered completely different. Shocks, air suspension or progressive travel springs, sway bars etc. Max pressure on a simple trailer is for STABILITY.....safety, not ride comfort.
 
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phillyg

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bigdee said:
Whoa! apples and oranges. RV suspensions are engineered completely different. Shocks, air suspension or progressive travel springs, sway bars etc. Max pressure on a simple trailer is for STABILITY.....safety, not ride comfort.
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Wrong! Travel trailers and fifth wheel trailer suspensions are not made for ride comfort. Most if not all states don't allow passengers to ride in them. Few have shocks or air, none I know of have sway bars. Air pressure charts published by tire mfgrs. are directly related to a tire's specific load carrying ability regardless of type of RV, even motorized ones.
 
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Bubbasboat

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jayhanig said:
The specification stamped into the sidewall of the tire refers to "cold pressure". So run it at the max cold 50 psi. Yes, the internal pressure will increase as the tire heats up but the manufacturer has already considered that in specifying a maximum cold pressure. Charle's Law, loosely described: In a closed vessel, pressure and temperature vary directly, IE, as one factor increases, so does the other.
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Listen to jayhanig and you'll never run on a hi center tread for over pressure and you'll never run on your sidewalls for under pressure. It's ok to run less load on a max load filled tire. The mfg already did the math for you!:)
 
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orangeTANG

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I pulled my boat out of storage tonight (sad its so late I know) and my father and I got into an interesting discussion. We filled our trailer tires to the recommended 50psi, with the boat on the trailer. I suspect that if I had filled them to 50psi off the trailer, when they were on the trailer, with the weight of the boat and the trailer on it that it would be quite a bit more than 50psi even when cold.

So does anyone know if the recommended pressure changes whether the tire is under load on the trailer vs sitting on the floor of your garage?
 
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