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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