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Old 08-01-2021, 05:42 PM   #1
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Tire rating question

I am trying to interpret the rating of my trailer tires. I have most of it figured out, but one part confuses me.

These are Goodyear Endurance tires.

Tires are ST235/80R16. 123/119N

ST235/80R16 is the tire size.

N is the speed rating, where N means 87 mph continuous speed.

123/119 should be the load rating code, but why are there two numbers? 123 should mean a load rating of 3,417 lb, and 119 should mean 2,998 lb.

Might someone clarify why there are two numbers where the load capacity should be?
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Old 08-01-2021, 05:59 PM   #2
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One is for single tire on the axle, the other rating is for when the tires are in a dual setup.
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Old 08-01-2021, 07:21 PM   #3
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Ah - thank you!
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Old 08-02-2021, 05:40 AM   #4
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Just for clarification... dual setup means on the same axle, like a dually pickup, not a tandem axle trailer. Dual tire axles are not that common on travel trailers but fairly common on cargo flat deck trailers.

On a tandem axle trailer you can still use the higher load rating.

Dually tires run hotter, thus the reduced rating.
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Old 08-02-2021, 09:50 AM   #5
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Tandom Axles

Dexter Axles are de-rated by 20% when two are used in tandem. Are you saying the tires on those tandem axles are not de-rated?
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Old 08-02-2021, 11:41 AM   #6
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Quote:
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Dexter Axles are de-rated by 20% when two are used in tandem. Are you saying the tires on those tandem axles are not de-rated?
Correct. Dexter likely derates axles for tandums because they place loads on each other via the center pivot when going over uneven ground, pot holes, etc.

Tire load rating gets derated when they are in a dually config (like on a F350 Dually rear axle) because they run hotter, things like the heat of the brakes gets transferred to the tires more (inner dually rim is cup shaped and surrounds the brake) plus less airflow between tires.

Single tires on tandum axles, like most travel trailers, each tire is "alone", doesn't wrap around the brake, and gets full airflow on both sides of the tire.

Of course you shouldn't exceed the which ever load rating is lower (axle or tire).

Even LT tires are derated for duals.
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