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Old 04-11-2019, 12:23 PM   #1
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E-rated Tire Pressure

Back again boys, and gals...

So I got the new E-rated tires and will have them installed soon. Sam's Club had the best price in my area by far.

So I am curious to hear from other half ton owners with E-rated tires; What pressures do you run for daily driving? What pressures are you running while towing? How was your factory (in dash) TPMS affected by the increased pressures?
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Old 04-11-2019, 01:02 PM   #2
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You're going to get a bunch of different answers so I'm almost afraid to give an answer here.

However, here is my experience.. 02 Jeep GC. Went from a smaller p-rated tire to a much larger E-rated tire. BFG AT TA's. I don't use this vehicle to tow with.

Stock PSI is 35. I went to 30 and it was about perfect. I now have 70k on those tires and swapped them out last weekend back to p-rated tires. Wear was even across the tire surface.

E-RATED tires typically have stiffer sidewalls and therefore require less PSI but that likely varies by application and manufacturer.

The chalk test is probably the best way to tell. There are also a few online calculators out there that'll give you a good starting place.
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Old 04-11-2019, 01:07 PM   #3
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This has been discussed tirelessly (See what I did there?) on the forums, please search.

You can also put the following into Google to get a number of threads to look though.

site:forestriverforums.com half ton e-rated tire pressure
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Old 04-12-2019, 05:48 AM   #4
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You can not compare what others use, with your situation.
For instance 007 also chanched to bigger sise with the E-load, wich yustifies a lower pressure.
If sises stay the same, you need a bit higher pressure for the same load. In American pressure/loadcapacity- lists the different loadranges are given in one list, and that is wrong.
European tiremakers give for every loadrange a seperate P/LC list .

To be short.
What you need for determining the right pressure is real weights on tires, maximum speed you use, and wont go over for even a minute, together with the tire- specifications 3 things.
1 maxload or loadindex
2 pressure behind AT on LT tires best, but loadrange stand mostly for a sertain AT pressure.
P tires only give max allowed cold pressure and comparable AT pressure is lower.
3 maximum speed of tire or speedcode.

Especially determining the loads on tires is the most tricky part in it all, often yudged wrong and if to low yudged can lead to blowing tire or treath-seperation.

Best is weighing per axle-end , 2nd best per axle, in the loading you use. Vehicle makers use the GAWR's to calculate the advice/prescribe- pressure, and often for max technical carspeed.
Noemal use is often only driver and a little load, then axle loads rear much lower. Load on front stay about the same in every loading.

This " pigheaded Dutch selfdeclared tirepressure- specialist" can help you with this . Give as much possible info you have , and I will calculate, and show where the limits are with that advice.
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Old 04-12-2019, 05:54 PM   #5
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Some time back I found this load inflation table and although it won't answer all the questions, it should answer some - or create even more!
Attached Files
File Type: pdf Tire to PSI DOCUMENT.pdf (1.44 MB, 17 views)
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Old 04-12-2019, 06:12 PM   #6
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When you are empty or not towing figure out what pressure rides the most comfortable. 35, 40, 50 PSI etc. When you are loaded or towing fill er up. I just put some LT265/70R16ís on my 1/2 ton and I leave them at 75-80 PSI all the time. They ride better than my previous P rated tires.
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Old 04-12-2019, 07:34 PM   #7
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Quote:
Originally Posted by larry2c View Post
Some time back I found this load inflation table and although it won't answer all the questions, it should answer some - or create even more!
X2 and what I go by with scale weights to get me in the ballpark.
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