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Old 09-15-2019, 10:29 AM   #1
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Tire Inflation

This ought to start a slew of opinions. Do you inflate your tires to the maximum PSI on the sidewall or do you inflate them based on the weight carried and manufacturer inflation table?
As an example, my Seismic 4113 has a GVWR of 20,600. The tires are marked for 80 PSI max. The tire inflation chart from Goodyear indicates that running at 70 PSI the tires can carry 23,000 pounds.
So for best tire life and safety, inflate to 70, 80 or ????
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Old 09-15-2019, 10:36 AM   #2
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I don't think this is as complicated as some like to make it. My Maxxis M8008's are E rated (2830 lbs) at max pressures of 80 psi. My travel trailer scales at 8500 lbs. My Maxxis tires are rated for 2540 lbs (load range D) at 65 psi, which is sufficient for the max weight of the trailer. I run 65 psi.
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Old 09-15-2019, 02:31 PM   #3
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If your GVWR of 20,600 how much does your trailer actually weigh with all the gear and fluids? Take it to a scale and get an accurate weight to make your inflation pressure decision.
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Old 09-15-2019, 03:00 PM   #4
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Trailer is 14,900 and 4000 on the pin
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Old 09-15-2019, 03:43 PM   #5
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Quote:
Originally Posted by Spadoc View Post
The tire inflation chart from Goodyear indicates that running at 70 PSI the tires can carry 23,000 pounds.
So for best tire life and safety, inflate to 70, 80 or ????
Who made the tires?...........
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Old 09-15-2019, 03:56 PM   #6
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Sorry, minor detail overlooked. Goodyear Endurance
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Old 09-15-2019, 04:36 PM   #7
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Originally Posted by Spadoc View Post
Sorry, minor detail overlooked. Goodyear Endurance
It was meant sarcastically. The people who made the tire know what pressure to use.

Goodyear tells you 70. I would and always did use the manufacturer's pressure charts after I weighed my MH or trailer. Tires wore great and the MH's always handled better.
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Old 09-15-2019, 06:50 PM   #8
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Quote:
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Trailer is 14,900 and 4000 on the pin
That sounds like empty weight not loaded.
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Old 09-15-2019, 08:14 PM   #9
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We run 80psi as indicated on our Endurance tires. What is your reason for going lower? Softer ride for the trailer?
I read this recently on RvSafetyFirst.com:

"The practice of under-inflating the tires to achieve a smoother ride is quite common amongst RVers and yet has no perceivable effect what so ever. In fact all it will do is cause the handling to suffer and create premature and irregular wear to the tires. 90% of tire failures are a result of poor inflation levels"


Not to say that you're actually under inflating since you're following the manufacturer's inflation table for that exact tire...
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Old 09-15-2019, 11:57 PM   #10
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For my trailer, 2017 Jay Flight 23RB, the GY Endurance ST205/75R15 LRD came OEM on the trailer. They have over 22K miles on them so far. My trailer is GVWR 6500#. I inflate each tire to the sidewall max of 65#.

The tires are wearing fine. They are no where close to being worn out. As for the ride, none of the stuff in the trailer has complained yet on how rough the ride is. Also with full air pressure in the tires, I don't have to worry if possibly on this trip, I have put too much weight in the trailer on say the left rear tire, while having the opposite corner tire, the right forward one, being too light.
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Old 09-16-2019, 08:01 AM   #11
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Always keep my tires, RV & TV, inflated to the max recommendation.
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Old 09-16-2019, 11:10 AM   #12
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Can someone explain , on the Sailun psi chart each tire size has a single rating and a dual rating, why is the dual weight rateing lower than the single ? What am I misunderstanding ?
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Old 09-16-2019, 11:39 AM   #13
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Quote:
Originally Posted by poohbear View Post
Can someone explain , on the Sailun psi chart each tire size has a single rating and a dual rating, why is the dual weight rateing lower than the single ? What am I misunderstanding ?
I don't know the exact reason, but you will find that on all brand tires.
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Old 09-16-2019, 12:07 PM   #14
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Trailers are a bit different than Cars/Trucks and MHs. For a Trailer, always fill to the maximum cold pressure noted on the sidewall.

For a vehicle, I start with the tires manufacture's recommended tire pressure for your load. remember front and rear tires may not be the same. I then adjust from there to get the right "Feel".
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Old 09-16-2019, 12:09 PM   #15
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Quote:
Originally Posted by poohbear View Post
Can someone explain , on the Sailun psi chart each tire size has a single rating and a dual rating, why is the dual weight rateing lower than the single ? What am I misunderstanding ?
Most tire manufactures de-rate a tire that is used as a dually. The reason being, when you drive over something like a curb. ALL of the load is on the side of that one tire, overloading it and places a lot of stresses on it.
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Old 09-16-2019, 01:16 PM   #16
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I follow the Goodyear chart and put the recommended PSI in based on the weight of the trailer. i adjust depending on load.
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Old 09-16-2019, 01:22 PM   #17
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Red face

Quote:
Originally Posted by Jagiven View Post
Trailers are a bit different than Cars/Trucks and MHs. For a Trailer, always fill to the maximum cold pressure noted on the sidewall.

For a vehicle, I start with the tires manufacture's recommended tire pressure for your load. remember front and rear tires may not be the same. I then adjust from there to get the right "Feel".
I am not disputing your characterization of the differences between trailers and cars / trucks and MH's....... But, why would tire manufactures, for all applications, supply pressure / weight ratings for every tire they make, if certain applications (trailers in your example) should "always" be inflated to the maximum pressure listed on the sidewall? Are they intentionally trying to confuse their customers, or provide their customers with the information necessary to make informed inflation decisions. Just asking. Maximum pressure suggests to me, just that, not that the tire is unsafe at a lesser pressure, per the manufactures published pressure / weight ratings. FWIW, no where on the Goodyear Endurance web site does it say "just inflate to sidewall rating and your good to go".
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Old 09-16-2019, 01:30 PM   #18
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Goodyear Information

I just found this on www.goodyearrvtires.com under weighing your RV:

Special Considerations
Unless trying to resolve poor ride quality problems with an RV trailer, it is recommended that trailer tires be inflated to the pressure indicated on the sidewall of the tire. Trailer tires experience significant lateral (side-to-side) loads due to vehicle sway from uneven roads or passing vehicles. Using the inflation pressure engraved on the sidewall will provide optimum load carrying capacity and minimize heat build-up.
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Old 09-16-2019, 02:32 PM   #19
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Quote:
Originally Posted by Jagiven View Post
Most tire manufactures de-rate a tire that is used as a dually. The reason being, when you drive over something like a curb. ALL of the load is on the side of that one tire, overloading it and places a lot of stresses on it.
Ah, so they actually mean side by side as in my dually truck and my tandem axle rv is to follow the single psi chart. The derateing you describe makes sense.
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Old 09-17-2019, 03:29 AM   #20
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It's great that you weight your trailer before every trip, after you've reloaded it.

Most people do not.

Quote:
Originally Posted by Twin Hauler View Post
I follow the Goodyear chart and put the recommended PSI in based on the weight of the trailer. i adjust depending on load.
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