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Old 06-22-2014, 11:05 AM   #1
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Question about load range G tires

Confused in South Carolina

ST235/80-16 load range E = max load =3500#s at 80 psi

7.50R16 load range G = max load 3300#s at 105 psi

If the air carries the weight, why is the LT tire rated lower?
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Old 06-22-2014, 12:28 PM   #2
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Short answer - LT tires have to be 'passenger rated' ,when people are involved the ratings are much more conservative.
ST tires just carry 'stuff' less likely to see lawyers chasing trailer rollovers.
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Old 06-24-2014, 05:28 PM   #3
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Goodyear does make a 16in G rated tire (G614RST) that's rated at 3700 @ 110psi.
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Old 06-25-2014, 06:26 AM   #4
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andy29847,
Different size tires have different load ratings, you have to use the same size with different load ranges to compare. The higher the load range, the higher the air pressure the tire can handle. The Goodyear tires that marspec is talking about are trailer only tires.
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Old 06-25-2014, 07:12 AM   #5
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Quote:
Different size tires have different load ratings,
ST235/80-16 load range E = max load =3500#s at 80 psi

7.50R16 load range G max load 3300#s at 105 psi


There 2 tires are almost the same size - the 7.50 is a little narrower and a little taller. I could understand the difference in advertised max load if both tires were load range "E". What I can't understand is a G rated tire that won't carry more weight. I suspect that there isn't really a science to the number. The manufacturers can advertised the max load of their tires at whatever weight they are willing to back up. The conclusion is that some manufactures are using max load ratings that offer a very small margin of error.
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Old 06-25-2014, 07:31 AM   #6
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Quote:
Originally Posted by andy29847 View Post
Confused in South Carolina

ST235/80-16 load range E = max load =3500#s at 80 psi

7.50R16 load range G = max load 3300#s at 105 psi

If the air carries the weight, why is the LT tire rated lower?
DUH?
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Old 06-25-2014, 03:51 PM   #7
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duh is right - what is your question? I wonder if you are making reference to the statement, "the air carries the weight".

Here is one explaniation:
How is the load capacity of a tire determined?
Let’s begin by reminding ourselves that
it is not the tire that carries the load,
but the air inside it. The tire is just the
container for that air. So, if you need to carry more load,
you need more air.
You might accomplish that with a larger air
chamber or by forcing more air molecules into the
same size air chamber you’d normally use for a tire with
a lower load capacity.
In other words, you might use a bigger tire or a tire
running at a higher inflation pressure.
Either way, the tire needs to be strong enough to
handle the higher capacity. The traditional ways of
defining this are “Ply Rating
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