What classifies a Load Ranges D or E Tire? - Ford Powerstroke Diesel Forum
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post #1 of 18 Old 02-12-2009, 01:48 PM Thread Starter
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What classifies a Load Ranges D or E Tire?

Why are the Nitto Terra Grapplers in 305/55/20 size only rated to 65psi and 3160lbs instead of 80psi and 3640lbs like the rest of the LOAD E tires? Can these still be used on the F350s if we plow, or carry a lot of weight often or trailer constantly with the trucks?

Is there something on paper that states a D tire holds 60-65psi and at least 3000lbs weight, and a E holds at least 3200lbs weight and is 80psi? After seeing these "E " load Nitto specs im just confused.


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post #2 of 18 Old 02-12-2009, 08:05 PM
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Some Terra Grapplers are D rated, and others are E rated. If you need a 305/55/20 try the Nitto Dura Grapplers.
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post #3 of 18 Old 02-13-2009, 07:44 PM Thread Starter
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Quote:
Originally Posted by JamesE View Post
Some Terra Grapplers are D rated, and others are E rated. If you need a 305/55/20 try the Nitto Dura Grapplers.
There is a set thats less than a year old on ebay, theyre E rated 305/55/20s Terra Grapplers, but only 65psi and 3100~lb weight load capacity? Is that really E or only D?


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post #4 of 18 Old 02-13-2009, 07:51 PM
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There is load range which is C, D, E, ect. What you really want to look at is payload capacity not the load range. Load range is a general symbol. Depending on tire size you can have a bunch different payload capacities with just 1 load range. I run D's and I've seen D's with a payload of 2900 lbs. to 3500 lbs. It depends on tire size.
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post #5 of 18 Old 02-13-2009, 07:56 PM
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Also, the load range tells what ply the tire is. If its load range D, then its a 8 ply tire. Load range E, 10 ply etc...

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post #6 of 18 Old 02-13-2009, 11:02 PM
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Quote:
Originally Posted by Goose350 View Post
Also, the load range tells what ply the tire is. If its load range D, then its a 8 ply tire. Load range E, 10 ply etc...
Its "ply rated" from back in Bias ply tire days even most E range tires are still only 4-6 plys.

I would be concerned more with the load capacity, I have 33X12.5X20 Toyo MTs that are E range and they only are rated for 2600



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post #7 of 18 Old 02-14-2009, 06:07 AM Thread Starter
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Quote:
Originally Posted by AFBLUE View Post
Its "ply rated" from back in Bias ply tire days even most E range tires are still only 4-6 plys.

I would be concerned more with the load capacity, I have 33X12.5X20 Toyo MTs that are E range and they only are rated for 2600
yeah, well the 305/55/20E Nittos say theyre E , but if my stock contis take 80psi and 3640lbs, going down to a 3200lb capacity just limited my total by almost 1000lbs

truck is about 7500 filled with a driver ~
1000lbs for snow plow setup
150lbs for rear spreader
3000-3500lbs in salt usually
can have an extra passenger

thats very close to the total capacity of the tires.


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post #8 of 18 Old 02-14-2009, 06:10 AM
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Quote:
Originally Posted by RamAirfreak98ss View Post
There is a set thats less than a year old on ebay, theyre E rated 305/55/20s Terra Grapplers, but only 65psi and 3100~lb weight load capacity? Is that really E or only D?
The 305/55-20 Terra Grappler is indeed E rated (10 ply rated). Each tire manufacture test their tires and rate them accordingly. Your truck calls for a LT tire with a minimum load index of 125 or higher. These Nittos only have a 121 load index.

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Last edited by Discount Tire; 02-14-2009 at 06:13 AM.
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post #9 of 18 Old 02-14-2009, 07:25 AM
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Does a D rated tire wear faster than an E rated tire on our 8,000# trucks
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post #10 of 18 Old 02-14-2009, 09:47 AM
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Quote:
Originally Posted by Redneck47441 View Post
Does a D rated tire wear faster than an E rated tire on our 8,000# trucks
That really depends on the use. As a daily driver, as long as the psi is set correctly, they typically wear the same. When towing, you may see more life out of the E rated tires.

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