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Old 03-21-2015, 09:27 AM   #1
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New Truck Tires HeLP

I am on my way out to buy new tire and I would like some help on whether to get load range C or D. I have a F150 with 275 -65 -R18 I am also getting a new TT a rockwood 8310 ss dry weigh 7033 hitch weight 856 . will C's be enough or should I get E's. I only tow about every other weekend mostly 300 mile round trips . My tire shop said E's are to much that I wont like them and the springs would give before the tire would even budge and that the C's were good for my use . Needles to say I value all of your opinion's . because you all tow and know what your talking about. Thanks .
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Old 03-21-2015, 09:45 AM   #2
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Sorry; I can't help since I tend to tow heavy. I am towing a Cedar Creek 34RL with a 3/4 ton Ram diesel engine truck. I am looking at a 10 ply tire for my needs a Nitto Dura Grappler 285/70R/17E 126R which has a weight rating of 3750 at 80 PSI.


I would suggest that you also look at a Ford F150 Forum and see what other users are towing with their F150 trucks. You might get a faster answer.
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Old 03-21-2015, 09:48 AM   #3
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Personally I would go for the "D" rating. If the load of a "C" is 1,600lbs, then four should handle 6,400lbs. You seem a bit over that.

I feel the sum of the tires load should be able to handle the GVWR of the trailer. This might not be exactly correct or how it works but it is a logical rule of thumb I feel comfortable with.

Others will be chiming in soon also. We all love to talk trailer weight and tires. lol.

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Old 03-21-2015, 09:54 AM   #4
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I would go with the LR E tires. You might overload the truck springs and just cause the truck to bottom, but if you overload the tires and one blows, you will have your hands and your seat full.
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Old 03-21-2015, 10:09 AM   #5
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I would go LR C. It is more than enough for your truck's payload. E's extra a more money from your pocket and have a ride penalty for the majority of time that you are not towing.
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Old 03-21-2015, 10:18 AM   #6
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I would go LR C. It is more than enough for your truck's payload. E's extra a more money from your pocket and have a ride penalty for the majority of time that you are not towing.
I put LR E on my truck and just let the air down to 35 front 30 rear when not towing and the ride is just fine, when I tow, I go 65-70 front-rear.
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Old 03-21-2015, 10:33 AM   #7
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I put E on my truck as well, i don't drop the pressure and the ride is a bit rougher but after all it is a truck! The tires cut through the snow better with a little more Nitrogen.
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Old 03-21-2015, 10:48 AM   #8
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I'd go with the load range E, not specifically that you need that much load rating, but the 10 ply sidewall will be more stable when towing and aired up to 65 or more psi.


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Old 03-21-2015, 10:50 AM   #9
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I run the PSI listed on the sidewall of the Coopers towing or not because there is nothing on the tire that says to do other wise.

Underinflated tires is one of the main reasons tires fail I will not run the risk of wrecking a 160 dollar tire or my truck by underinflating it.

Run the pressure on the sidewall of the tire, it IS the safe thing to do.
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Old 03-21-2015, 11:04 AM   #10
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Quote:
Originally Posted by HIDE OUT View Post
I am on my way out to buy new tire and I would like some help on whether to get load range C or D. I have a F150 with 275 -65 -R18 I am also getting a new TT a rockwood 8310 ss dry weigh 7033 hitch weight 856 . will C's be enough or should I get E's. I only tow about every other weekend mostly 300 mile round trips . My tire shop said E's are to much that I wont like them and the springs would give before the tire would even budge and that the C's were good for my use . Needles to say I value all of your opinion's . because you all tow and know what your talking about. Thanks .
Howdy HIDE OUT, just some observations from my perspective of being in the tire biz. It may be hard to find a Load Range D tire in your sizing. Many manufacturers have really consolidated their passenger tire and light truck lines and have done away with Load Range D tires in many sizes. They usually make a SL (standard load or XL extra load), a Load Range C, and a Load Range E (for 3/4 tons and heavier). They are load range D's in some sizes though.

Even if your wheels will safely handle the air pressure of a Load range E tire at 80 psi, you don't necessarily have to run that much pressure which is going to be a stiff ride on a F-150, especially if you don't have a load connected to the truck. However, as heavy as a Load Range E tire will be, you also don't want to run it at too low a pressure, as it will heat up. The heavier the tire, the more energy (fuel) it takes to turn them too.

Now, there has also been some more changes of the years late, in the proliferation of passenger and light truck tires. You can't just necessarily assume that a Load Range C tire will carry a lot more load than a P (either standard load or extra load) tire. This is what causes a lot of confusion too. I would advise to look at the Load Index number of each tire you are interested in, and it will define how much weight the tire is made to handle....and not necessarily just the ply rating if it has one. You could possibly find a SL tire that runs at 51 psi and handles similar weights to a Load Range C tire at 50 psi.

Did I help or confuse the issue even more?

EDIT: Airdale correctly pointed out that I neglected to add that when using a P tire on trucks carrying heavier loads, that the load index number needs to be divided by a factor of 1.1 to safely figure in the weight capacity of the tire. Ex: a Load index of 116/2756 lbs should be factored as 2505 lbs when used on a pickup.

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