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Old 06-25-2016, 11:04 PM   #11
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For "P" passenger tires, always go with the max. pressure noted on the sidewalls. I agree with Kenny Kustom that an upgrade to "LT" light truck tires would be beneficial.

The vehicle certification label, tire placard and owner's manual always display the correct tire inflation pressures, even in Canada.
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Old 06-25-2016, 11:17 PM   #12
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Normally the inflation pressures found on the tire placard (certification label) are appropriate all the way to the vehicle's GVWR. If they are not, the vehicle owner's manual will have the recommended pressures for towing conditions.
This is the BEST information for OEM tires.

When I upgraded to LT tires I emailed Michelin directly and told them my vehicle, original tires and new tires and they responded with the correct PSI. AND, if I recall correctly they let me know within 48 hours.
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Old 06-25-2016, 11:48 PM   #13
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Originally Posted by Kf4mnc View Post
This is the BEST information for OEM tires.

When I upgraded to LT tires I emailed Michelin directly and told them my vehicle, original tires and new tires and they responded with the correct PSI. AND, if I recall correctly they let me know within 48 hours.
OEM recommended tire inflation pressures are not set by a tire manufacturer. They are always set by the vehicle manufacturer.

If you have changed tire sizes the installer should set new recommended tire pressures for tires of a different size and/or design.

The wording of your question to Michelin will determine their answer.

Did Michelin provide you with an answer that would require your replacement tires to have enough load capacity to equal or be greater than the OEM tires provided?
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Old 06-26-2016, 10:19 AM   #14
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Originally Posted by Airdale View Post
The vehicle certification label, tire placard and owner's manual always display the correct tire inflation pressures, even in Canada.
The vehicle manufacturer's placard provides their "recommended" tire pressure for the best ride based on what they consider to be typical driving conditions. Yes, their recommended psi will be good up to the GVWR, but there is no reason you can't go with the max. pressure indicated on the tire sidewall for improved stability if you are at or slightly over the GVWR as is often the case. As long as we understand that it does nothing to increase the GVWR.

I upgraded my tires from P to LT and inflate the LT tires to 65 psi based on manufacturer's recommendations and my seat-of-the-pants feeling about performance based on experimentation. The LT tires can go up to 80 psi but I don't need that much pressure for my weight.
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Old 06-26-2016, 12:07 PM   #15
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Originally Posted by itat View Post
The vehicle manufacturer's placard provides their "recommended" tire pressure for the best ride based on what they consider to be typical driving conditions.

In the world of tire inflation pressures, recommended and correct mean the same thing. Vehicle manufacturer's must use the rules as they apply to them. Inflation pressures set by vehicle manufacturers are not arbitrary, they are set in accordance with FMVSS 571.110 & 571.120.

Yes, their recommended psi will be good up to the GVWR, but there is no reason you can't go with the max.

That is true. However, going over GVWR is never recommended.
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Old 06-26-2016, 12:22 PM   #16
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Originally Posted by Airdale View Post
OEM recommended tire inflation pressures are not set by a tire manufacturer. They are always set by the vehicle manufacturer.

If you have changed tire sizes the installer should set new recommended tire pressures for tires of a different size and/or design.

The wording of your question to Michelin will determine their answer.

Did Michelin provide you with an answer that would require your replacement tires to have enough load capacity to equal or be greater than the OEM tires provided?
I was referring to the OEM recommendations by the manufacture for the OEM tires. Which you also stated in the post immediately preceding mine. I don't understand what you are questioning? We are saying the same thing?

Regarding the reply from Michelin, I have copied it below.

Quote:
02/18/2015

Hello Chris,

Thank you for your email. We welcome the opportunity to serve you.


In regards to the email you sent stating:
---------------------------------------------------------------------
To Whom it May Concern,
I am writing in regards to a recent tire purchase I made. I am inquiring as to what the recommended tire pressure should be since I am not running the factory size tire on my vehicle. The specs are below:

Vehicle:
2008 Toyota Tundra Double Cab
4.7L 4X4

Original Factory Size:
P255-70-18
Recommended Factory Inflation:
30 PSI Front 33 PSI Rear

Current Size:
LT275-70-18
What would the recommend Inflation be for the new size?

Thank You for your help!

Chris

---------------------------------------------------------------------

The best air pressure recommendation for the original equipment size tires is to use the inflation pressure as specified by the vehicle manufacturer which can be found on the placard located on the driver’s door jam or in the vehicle owner’s manual. They have determined the optimal inflation pressure for load, ride, handling, rolling resistance and treadwear performance.

Maintaining correct tire inflation pressure helps optimize tire performance and fuel economy. Correct tire inflation pressure also allows you to experience tire comfort, durability and performance designed to match the needs of your vehicle.

Based on the original equipment tire size and inflation pressures of 30 psi front and 33 psi rear, we would recommend that you inflate your tires to 45 psi front and rear for comfort, handling; including even tire.

Michelin 1-866-866-6605

We appreciate your business.

It is our goal to ensure that your issue has been resolved or your question answered to your satisfaction. If we can assist you further, please respond to this email or call us at 1-866-866-6605 (toll free) between 8:00AM and 8:00PM Eastern Time Monday through Friday or between 8:30AM and 4:30PM Eastern Time on Saturday.

Sincerely,

Alvin
Folks really are making this more complicated than it should be. Go by what your manual states and you should be fine. Stating that people should have to contact each tire manufacture is just crazy. The vast majority of folks will not do that, so it is prudent that the manufacture provided accurate information. Now, should you replace their tires with none OEM equipment that is another story. At that point the owner is responsible for determining the appropriate pressure, at which point, may require contacting the tire manufacture and the vehicle manufacture.
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Old 06-26-2016, 08:10 PM   #17
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Originally Posted by Kf4mnc View Post
I was referring to the OEM recommendations by the manufacture for the OEM tires. Which you also stated in the post immediately preceding mine. I don't understand what you are questioning? We are saying the same thing?

Regarding the reply from Michelin, I have copied it below.


Folks really are making this more complicated than it should be. Go by what your manual states and you should be fine. Stating that people should have to contact each tire manufacture is just crazy. The vast majority of folks will not do that, so it is prudent that the manufacture provided accurate information. Now, should you replace their tires with none OEM equipment that is another story. At that point the owner is responsible for determining the appropriate pressure, at which point, may require contacting the tire manufacture and the vehicle manufacture.
What I said.

If you have changed tire sizes the installer should set new recommended tire pressures for tires of a different size and/or design.

It is important to remember that OEM Passenger tires fitted to a pick-up truck MUST be degraded for fitment to the truck. Vehicle manufacturers will do the math when selecting the tire for fitment. The load capacity of the "P" tire at a given inflation pressure MUST be lowered by dividing the value found on the tire's load inflation chart by 1.1.

Excerpt from FMVSS 571.110, paragraph S4.2.2.2; When passenger car tires are installed on an MPV, truck, bus, or trailer, each tire's load rating is reduced by dividing it by 1.10 before determining the sum of the maximum load ratings of the tires fitted to an axle.
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Old 07-07-2016, 01:29 PM   #18
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Here's all you need to know about tow vehicle and RV PSI.
http://fifthwheelst.com/step5.html

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Old 07-07-2016, 01:34 PM   #19
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Originally Posted by Airdale View Post
Normally the inflation pressures found on the tire placard (certification label) are appropriate all the way to the vehicle's GVWR. If they are not, the vehicle owner's manual will have the recommended pressures for towing conditions.
This is the answer.
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Old 07-07-2016, 02:35 PM   #20
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Originally Posted by Kenny kustom View Post
I would swap out the passenger tires for a set of truck tires.


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X2 I did and feels good. My first towing with a 25 foot toy hauler was on 44 psi at PSI van tires . Was on 40 psi van tires. Blowout one trip flat tire next trip new tires third trip
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