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Old 04-03-2021, 08:29 AM   #1
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Tire loading question

2015 F250 LT275/65P20 load range E Michelin tires

So the door pillar sticker says combined weight of cargo and occupants should never exceed 2765 lbs cold tire pressure 65 psi, tires say 3750 lbs @ 80 psi cold max, should I really only be running at 65 psi or run at 80 psi but still have to go by sticker as far as loading capacity?
Is the key word here MAX. Seems like I can't use the tires to there rating at all if I go by Ford sticker.
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Old 04-03-2021, 08:42 AM   #2
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Quote:
Originally Posted by Trvltrash View Post
2015 F250 LT275/65P20 load range E Michelin tires

So the door pillar sticker says combined weight of cargo and occupants should never exceed 2765 lbs cold tire pressure 65 psi, tires say 3750 lbs @ 80 psi cold max, should I really only be running at 65 psi or run at 80 psi but still have to go by sticker as far as loading capacity?
Is the key word here MAX. Seems like I can't use the tires to there rating at all if I go by Ford sticker.
It depends. The 3750# is individual tire max loading capacity. You’ll need to time four, thats what support the GVW.

However, if you have heavy load in the bed, let’s say 2500 #. Then the rear axle would likely have 5500 lbs, which is supporting by two rear tires. That’s the time to consider increasing the rear tire pressure.
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Old 04-03-2021, 08:44 AM   #3
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You inflate your tires to the load they are carrying. Go to a truck scale at a truck stop and get axle weights on your rig, it's tough to get wheel weights at but if you can so much the better. Divide the axle weights by 2 and add 10% for uneven loading. Then get the inflation table from the tire manufacturer and look those weights up on the inflation table. That will tell you what your COLD tire inflation should be. Inflate them in the morning before the sun has had time to heat them. Don't worry if they get higher during the day when you travel, this is normal and allowed for in the tables. The inflation on the sidewall is the maximum load you can carry and only applies if the tire is at it's maximum load. It doesn't appear as if yours are. Good luck.
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Old 04-03-2021, 09:47 AM   #4
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Note that the tire manufacturer's load chart only tells you the maximum load that the tire can safely handle for any given pressure. It does not recommend that you use that pressure. You should go by the recommendations of the vehicle manufacturer, who decides the best combination of load,

ride comfort and handling for his particular vehicle.
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Old 04-03-2021, 10:09 AM   #5
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Agree that most 'E' rated tire capacity exceed the payload of the truck. For example a truck with a rear axle capacity of 4,900lbs like the Nissan Titan XD will have rear 'E' rated tires with a capacity of 3,400lbs each or 6,800lbs.

Same for most 3/4 ton trucks with a rear axle capacity of 6,000lbs. The rear tire capacity will be 6,800lbs.

There are different weight ratings within the tire type 'E'. You can google this to see the difference. I kinda remember 'E' rated tires go from 3,200lb capacity to 3,800lb capacity.
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Old 04-03-2021, 10:00 PM   #6
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Michelin chart shows # 6390 axle weight @ 65 psi, so why would I ever need to go over 65psi ? Why do people inflate to 80psi ? RAWR #6100
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Old 04-03-2021, 10:09 PM   #7
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I run 'E' rated Michelins
I air them to 45# when NOT towing
I air them to 80# when towing my 5th wheel cause I am running close to RAWR

Front tires ...at 60# towing or Not
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Old 04-03-2021, 10:22 PM   #8
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Quote:
Originally Posted by Trvltrash View Post
Michelin chart shows # 6390 axle weight @ 65 psi, so why would I ever need to go over 65psi ? Why do people inflate to 80psi ? RAWR #6100
Provided you're always under the RAWR , 65 psi . is enough .

Getting your loaded for travel weights is always a good idea.

Is your 2765 payload the highest available on a truck similar to yours , could be the factory just uses the same tires on all the trucks regardless of weight rating options and others with higher payload would require more pressure when loaded to max RAWR.

OR; they just don't do the reading you have and figure the tire says 80 , I'd better run 80 .
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