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Trailer Tire Pressure

Old 04-08-2021, 09:34 AM
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I run max pressure, I canít find a pressure chart for my tires (Kenda Loadstar Radials, 13Ē, Load D). Even if I found a chart would probably run max pressure, I believe it rolls easier, turns easier and flexes less, which reduces heat and wear. Seems to work great for me, I was blowing tires before switching to Load D, the load c tires had barely enough capacity for my trailer and boat. Once going to load D and from 50psi to 65psi, no problems.
Old 04-08-2021, 10:01 AM
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I've been hauling boats since the 70's all over the country, max pressure is the correct answer here. I've never seen a tire failure due to proper air pressure. Seen many blowouts due to under inflation.
Old 04-08-2021, 09:29 PM
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How many of you max pressure guys do the came on your cars and pickups?
Old 04-09-2021, 06:15 AM
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Originally Posted by Milehog View Post
How many of you max pressure guys do the came on your cars and pickups?
Truck tires and trailer tires are made different and for different purposes. My truck and my boat weigh about the same. My truck tires are 275/60r20 and my trailer tires are 175/80r13, so my trailer tires are much much smaller but hold the same weight, so they have to have much more pressure. Plus, on the truck itís for comfort, Iím more worried about tire life on my trailer than comfort.
Old 04-09-2021, 06:17 AM
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Originally Posted by Milehog View Post
How many of you max pressure guys do the came on your cars and pickups?
Not necessarily max, but I do run them tighter than the door jam recommendation due to running higher load rating tires than stock.
Old 04-09-2021, 08:45 AM
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Originally Posted by Milehog View Post
How many of you max pressure guys do the came on your cars and pickups?
Real men donít drive cars.
Old 04-09-2021, 09:40 AM
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Originally Posted by Milehog View Post
How many of you max pressure guys do the came on your cars and pickups?
Thatís different, and I believe was stated earlier in the thread. Inflation pressures for cars and trucks are lower than max, and largely for comfort, and sometimes safety to reduce rollover risk. The Firestone/Ford Explorer problems many years ago point to this. IIRC, Ford specíd a very low inflation pressure to reduce rollover risk. That may have been a factor in the blowouts as the tires flexed more and generated more heat.

Boat trailers donít generally have passengers, so the main concerns are capacity and heat. Max pressure allows for the highest rated capacity and reduces heat buildup. My trailer came with D rated tires and I kept them inflated to 65 psi. Currently I have E rated tires, and run them at 80 psi. Changing trailer tires on the side of the road is not fun, so I try to avoid as much as possible.

On my truck, I donít run max, but I do run a little more full than the door says. Door calls for 65/70 (F/R), I usually run 70/75.
Old 04-09-2021, 10:34 AM
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Oh gees. This is sad. I pulled my 27' footer over 100,000 miles. Have more than that on my little tin boat. I've been at this for over 50 years - had my ticket for 20 years. Most importantly I think and reason and analyze. You don't like my advice fine - but that also puts you at odds with the manufacturer;s posted chart. Not so fine. And "No" I said NOTHING about Chinese tires. The subject here is proper tire inflation, and I did add load rating to the subject. A relevant addition I think; tney go together. Sure, if you have a tire with no reserve capacity, the tire needs to be at max pressure. That is hardly a recipe for trouble free and long service life. Your success does not make you right. Your reasoning would lead people to fish with line that tests 100 times the target species weight - and a million other such purely ridiculous recommendations on the basis of, it hasn't failed yet. There IS a proper inflation for tires other than MAX as long as the tire has a rated capacity above the actual load.
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Old 04-09-2021, 10:52 AM
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Originally Posted by NLOL View Post
Oh gees. This is sad. I pulled my 27' footer over 100,000 miles. Have more than that on my little tin boat. I've been at this for over 50 years - had my ticket for 20 years. Most importantly I think and reason and analyze. You don't like my advice fine - but that also puts you at odds with the manufacturer;s posted chart. Not so fine. And "No" I said NOTHING about Chinese tires. The subject here is proper tire inflation, and I did add load rating to the subject. A relevant addition I think; tney go together. Sure, if you have a tire with no reserve capacity, the tire needs to be at max pressure. That is hardly a recipe for trouble free and long service life. Your success does not make you right. Your reasoning would lead people to fish with line that tests 100 times the target species weight - and a million other such purely ridiculous recommendations on the basis of, it hasn't failed yet. There IS a proper inflation for tires other than MAX as long as the tire has a rated capacity above the actual load.
What you say is true....but here's the thing...how many people actually bother to go to a damn cat scale? Look at all the tongue weight threads, and other weight related stuff. Nobody seems to be able to be bothered with such....they would rather spend 4 hours on the internet doing theoretical math than they would 20 going to the local truck stop. Given that propensity in terms of behavior, and the fact that sans hard data to work from....suggesting max pressure is the safe bet, and the only one that can be offered given those factors.
Old 04-09-2021, 12:06 PM
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That reasoning is sound. I simply judged the OP as a cut above.
Old 04-09-2021, 12:11 PM
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Originally Posted by NLOL View Post
Oh gees. This is sad. I pulled my 27' footer over 100,000 miles. Have more than that on my little tin boat. I've been at this for over 50 years - had my ticket for 20 years. Most importantly I think and reason and analyze. You don't like my advice fine - but that also puts you at odds with the manufacturer;s posted chart. Not so fine. And "No" I said NOTHING about Chinese tires. The subject here is proper tire inflation, and I did add load rating to the subject. A relevant addition I think; tney go together. Sure, if you have a tire with no reserve capacity, the tire needs to be at max pressure. That is hardly a recipe for trouble free and long service life. Your success does not make you right. Your reasoning would lead people to fish with line that tests 100 times the target species weight - and a million other such purely ridiculous recommendations on the basis of, it hasn't failed yet. There IS a proper inflation for tires other than MAX as long as the tire has a rated capacity above the actual load.
If youíre not too busy driving your 27í boat around, read this:

https://one.nhtsa.gov/cars/rules/rul...dex.html#ref74

Youíll find tire manufacturers are held to different standards for st tires as they are for lt tires.

What is a ticket and how does it apply to pulling trailers? Youíre saying youíre a captain?
Old 04-09-2021, 12:14 PM
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So much emotion on a silly topic. You guys want to argue about how loose to set your lug nuts next?
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Old 04-09-2021, 02:09 PM
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Was; 100 ton uninspected passenger vessel. I'm sure there are quite a few here. Most years still, I pull my boat 12-15,000 miles. I'm saying I know more about the subject than, "I've inflated my tires to max for 20 years and it's worked well for me". I'm saying that manufacturers provide inflation information because the simple policy of inflate your trailer tires to the max pressure, regardless of load, is not the best policy. To those who disagree, I recommend you search manufacturer's websites to see what they say.
Old 04-09-2021, 03:55 PM
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Originally Posted by NLOL View Post
Was; 100 ton uninspected passenger vessel. I'm sure there are quite a few here. Most years still, I pull my boat 12-15,000 miles. I'm saying I know more about the subject than, "I've inflated my tires to max for 20 years and it's worked well for me". I'm saying that manufacturers provide inflation information because the simple policy of inflate your trailer tires to the max pressure, regardless of load, is not the best policy. To those who disagree, I recommend you search manufacturer's websites to see what they say.
i canít find the tire manufacturerís load chart so I will just go with Max. But I have no worry if someone else wants to use a tire chart and go with a laser pressure. They will probably be fine, especially with a good tire. Itís personal preference, I have noticed on those charts that it doesnít say they are required to use those pressures but they are the minimum pressure for a specific load, nothing that you canít be higher than the chart.
Old 04-09-2021, 05:26 PM
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Originally Posted by NLOL View Post
Was; 100 ton uninspected passenger vessel. I'm sure there are quite a few here. Most years still, I pull my boat 12-15,000 miles. I'm saying I know more about the subject than, "I've inflated my tires to max for 20 years and it's worked well for me". I'm saying that manufacturers provide inflation information because the simple policy of inflate your trailer tires to the max pressure, regardless of load, is not the best policy. To those who disagree, I recommend you search manufacturer's websites to see what they say.
you do realize caj runs 100k+ per year? Himself. Guessing if you add employees itís 3-4 times that.
Old 04-09-2021, 08:48 PM
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Originally Posted by NLOL View Post
Was; 100 ton uninspected passenger vessel. I'm sure there are quite a few here. Most years still, I pull my boat 12-15,000 miles. I'm saying I know more about the subject than, "I've inflated my tires to max for 20 years and it's worked well for me". I'm saying that manufacturers provide inflation information because the simple policy of inflate your trailer tires to the max pressure, regardless of load, is not the best policy. To those who disagree, I recommend you search manufacturer's websites to see what they say.
I believe I have more practical knowledge than any website. The fact none of your charts reference ambient temperature is enough for me to conclude they're useless.

Did you not read the NHTSA article I posted for you? It describes how the reserve capacity of a light truck tire and a trailer tire are computed differently. It would certainly help you to understand why those charts are not compatible.

Old 04-09-2021, 08:54 PM
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Originally Posted by autobaun70 View Post
you do realize caj runs 100k+ per year? Himself. Guessing if you add employees itís 3-4 times that.
I buy a lot of tires. That's for sure.
Old 04-09-2021, 09:51 PM
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No I did not know that; and you didn't know that I too have a CDL and once employed 5 fulltime drivers in my fleet, serving my other companies. It is hardly relevant. What is relevant is the information contained in post #17. and the personal espoused that deny/dispute that information. Those of you touting max pressure don't have the credentials to get hired as tire engineers, nor as expert witnesses, yet you claim to know better than the people who design, test, and pay the penalty if the information they provide is faulty.
Old 04-10-2021, 12:02 AM
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Originally Posted by cajflynn View Post
The fact none of your charts reference ambient temperature is enough for me to conclude they're useless.
Um, cold tire inflation pressure ring a bell?
The same tire in Nome in February will require more air molecules than in August in San Antonio. Cold tire inflation covers it.
Old 04-10-2021, 03:36 AM
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You guys have me so worried about the correct tire pressure that I’ve decided to replace all of my tires with these beauties from harbor freight.




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