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Old 07-13-2016, 09:35 AM   #1
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Tire pressure

I replaced my Tundra's stock tire with high load 10 ply Michelins.
My dealership only fills the tire to the sticker on the truck (32 psi). Tire is rated 65 psi. I asked to inflate to 50 psi. Service advisor said if I inflate to 50 psi it will cause the center tread to wear out faster. Anyone know if this is true?
Currently tire pressure looks low. What to you run your tires at compared to door specs/tire specs?
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Old 07-13-2016, 09:54 AM   #2
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Manufactures put the sticker on the door, to optimize ride, and fuel economy.

If your tires are rated for 65 psi, you should have no issues running at a higher pressure.

I installed new tires on my TV 18 months ago. For my TV and HTT combo, I found I have increased my rear tire pressure by 10 psi, in the rear, and 5 psi in the front over factory recommendations. For me this gives me a nice ride. I am still below the maximum tire pressure rating. I have seen NO signs of uneven tire wear.
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Old 07-13-2016, 02:07 PM   #3
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Tirepressure advice is all about
1. load on seperate tires /maximum load of tire.
2. The speed you wont go over for even a minute.

I am able to calculate it for you but need some data for it.

From car best determined seperate wheel weights, second best Axle weights, but in lack of that the Emty weigt of car, Maximum permissable Axle Weights\\ and Vehicle weight ( Shortened MPAW/MPVW amerikan GAWR/GVWR for Gross Axle/Vehicle Weight Rating), and the way you load it with persons and gargo.

Then this maximum speed you use for the situation and wont go over for even a minute.

A thing I did not mention yet is the Camber angle on mostly rear tires if above 2 degr.

Then from tires
1. the maximum load or loadindex.

2.Kind of tire to determine the pressure needed for maximum load up to max speed of tire ( or if lower 99m/h) called reference-pressure/ AT-pressure/maxloadpressure . This is not the maximum cold pressure of a tire, wich are only given on Standard load and XL/reinforced/Extraload tires.

Your normal tires where probably Standard load with At-pressure of 35 psi and AT of your new tires is 65 psi ( your read probably from tire something like this "maximum load xxxx lbs AT 65 psi ( cold)").
This makes it a 8 plyrated/D-load tire , and not a 10 PR/E-load.

Anyway , a tire with higher At-pressure needs a bit higher pressure for the same load on it, then a tire with lower AT-pressure.

So your 32 advice standard , has to be highened up a bit, but let me calculate.

Greatings from a Dutch Pigheaded Self-declared Tirepressure-specialist
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Old 07-13-2016, 02:14 PM   #4
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Quote:
Originally Posted by ParrishCamper View Post
I replaced my Tundra's stock tire with high load 10 ply Michelins.
My dealership only fills the tire to the sticker on the truck (32 psi). Tire is rated 65 psi. I asked to inflate to 50 psi. Service advisor said if I inflate to 50 psi it will cause the center tread to wear out faster. Anyone know if this is true?
Currently tire pressure looks low. What to you run your tires at compared to door specs/tire specs?
I would assume that the pressure listed on the sticker of the vehicle is the pressure of the OEM tires. Since you no longer have OEM tires I would use the pressure from the new tire's sidewall.
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Old 07-13-2016, 02:56 PM   #5
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The vehicle manufactures put lots of R&D hours into determining the optimum tire pressure for a vehicle. The weight of the vehicle, the quality of the ride, the handling, and the fuel mileage are all considered.

On a pickup, the recommended tire pressure for the rear assumes the truck is loaded to capacity, so you are actually better off running a lower pressure when the vehicle is unloaded.

Running unnecessarily high air pressures will compromise the vehicle's handling and can cause you to lose control.

My recommendation is to follow the manufacturers suggested air pressures. If you've upgraded the tires to a higher load range, then you have the ability to raise the air pressure when you pull the trailer, and then return the air pressure to normal when the trailer is unhitched.
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Old 07-13-2016, 05:46 PM   #6
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My new tires are Michelin Defenders LTX Load Range E.
Max load is 3415 at 80 psi cold
I don't know the truck weigh. 2013 Toyota Tundra.
Tongue weight of camper is 850lbs.
I know we are close to our load capacity which is why we opted for better tires.
Need to hit the scales now that we have camper out a couple of times.
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Old 07-14-2016, 08:05 AM   #7
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at 32 psi I will bet his truck originally came with P rated tires...
Just go to an air compressor and pump up your tires to the pressure listed on the sidewall and FORGET THE DEALER...
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Old 07-14-2016, 08:38 AM   #8
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IMHO, 32psi is not sufficient pressure for an E rated tire. The yellow sticker has already been done by my changing the tire rating. You can't follow part of the sticker, it's a system. But also IMHO you did the right thing by upgrading the tires.
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Old 07-14-2016, 10:20 AM   #9
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IMHO, 32psi is not sufficient pressure for an E rated tire. The yellow sticker has already been done by my changing the tire rating. You can't follow part of the sticker, it's a system. But also IMHO you did the right thing by upgrading the tires.

I just removed a set of load range E Firestones from my half ton truck. The recommended tire pressure for that truck is 35 psi for both front and rear. Since that truck is my daily driver and usually driven around empty, I routinely ran 35 psi in the front and 28-30 psi in the rear. I aired up the tires any time I pulled a trailer or loaded the bed.

When I removed those tires last month, they had about 60,000 miles on them and plenty of tread still remaining.

Once again, the air pressure is for the load, not for the tires. Running unnecessarily high air pressures causes a harsh ride, degraded handling, and uneven tire wear.
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Old 07-19-2016, 05:14 AM   #10
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My truck came with max tow and LT tires (c rated load range I believe). My sticker says 40 psi. One year ago the tires were replaced with LT e rated max 65 psi. When I'm not towing I run the 40 psi. If I'm towing longer distance I bump my rear to 55 psi. I got this number based on my r.a. Weight when towing. There is a calculator I got for weights and psi on the internet but can't recall where...
I would bump your pressure to 40 psi minimum on those new tires. 32 psi is definitely a p rated tire.
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