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Old 08-21-2016, 12:07 AM   #1
busterbrown
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What does "dual max load" actually represent with tire load ratings?

When a tire manufacturer stamps "single max load" and "dual max load" ratings on its tires, is it in reference to dual axles with 1 tire on each side of the axle? Or is it in reference to 2 tires on each side of the same axle? As I research tire load capacities, should I be concerned with only the "single max load" rating on my dual axle travel trailer?
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Old 08-21-2016, 03:45 AM   #2
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Dual max load is for two tires together like on a dually truck. If they are not together you use single max load. Like on a camper.
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Old 08-21-2016, 05:42 AM   #3
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Your trailer has two axles "in tandem" (not dual) fitted with a single wheel on each end of each ale.
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Old 08-21-2016, 08:43 AM   #4
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The dual rating found on a tire's sidewall is for tires when used in a side-by side fitment such as on rear axles of dually trucks.

One of the purposes of the lower load capacity for such fitments is to offset the effects of road crown.

On another note; I often recommend tire rotation from side to side on RV trailers because of the effects of road crown, especially if someone is using a lot of state and undivided US highways.
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Old 08-23-2016, 11:34 AM   #5
Outback 325BH
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What does "dual max load" actually represent with tire load ratings?

"Single" is when the tire is the only one on the end of the axle.

"Dual" is when there are two at the end of the axle. Just like a dually (DRW) truck.

The "single" rating is how much weight that tire is rated to carry when in the "single" configuration.

The "dual" rating is how much weight that one tire is rated to carry in the "dual" configuration. Sine you have two tires in the dual configuration, the "dual" rating is doubled for that end of the axle. The "dual" rating would be quadrupled for the whole axle, as you would have four tires on the same axle.

The whole reason for this is because, in the event of a flat tire the other tire will be carrying the load that was being carried by both tires.

The reason the same logic does not apply in a tandem-single situation is, in the event of a flat tire the flat tire is still carrying a load. The good tire in front of or behind the flat is not carrying the entire load... as is the case in the "dual" situation.

So... the "dual" rating is always less than the "single " rating, however you can still carry more because you have two instead of one.

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