18" vs 20" for towing and off-road

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Deadman

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What are you guys possibly pulling/hauling that you "need" E range tires? I mean the trucks limited by its axles, springs, etc.
I ran some D's on my 3/4 ton Diesel and they were fine dragging my tractor around. I know they were to their max capacity, but they rode a $hit ton smoother than the E's I run in winter to plow snow.
 

mwl001

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What are you guys possibly pulling/hauling that you "need" E range tires? I mean the trucks limited by its axles, springs, etc.
I ran some D's on my 3/4 ton Diesel and they were fine dragging my tractor around. I know they were to their max capacity, but they rode a $hit ton smoother than the E's I run in winter to plow snow.
I wonder that too... I'm towing a travel trailer that's almost 6k lbs, I have the 22" tires and while I have been exploring options on tightening up the rear end (probably trying a Gen Y hitch first) I don't think the tires are even the 3rd or 4th weakest point. That may be different for other wheel sizes, OR bigger/heavier trailers, which I wouldn't try, as capable as the vehicle is.
 

Fozzy

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What are you guys possibly pulling/hauling that you "need" E range tires? I mean the trucks limited by its axles, springs, etc.
I ran some D's on my 3/4 ton Diesel and they were fine dragging my tractor around. I know they were to their max capacity, but they rode a $hit ton smoother than the E's I run in winter to plow snow.

For me it’s more about the off road strength and durability than the extra load rating. Plus a lot of the bigger more aggressive tires I like are harder to get in a C or D. If I do kill a tire most places with have what I want in the E. But you do take a hit on ride and MPG’s.


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LazSlate

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I know this is an older topic but Load Range Rating is also relative to sidewall height and that is why some tires are only in E.
With a 17 or 18" rim and a tall tire the side wall flex would be excessive if it were too thin therefore most high side profile tires tend to have more/stronger sidewall plys. There is also another tire spec called Load Index which translates better to what the tire can handle in weight.

A 35/17 tire with load range D would probably have too much lateral flex as opposed to a 35/17 load range E.
 

FlyBry

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No doubt the load capacity of the vehicle determines the max limit. What some E range tires offer, is the ability to safely run higher PSI when towing. Some of the Michelin E range tires, LTX, have 3 steel belts instead of the standard 2. This may offer additional flat resistance.
 
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