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Old 02-06-2013, 08:44 PM   #15
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Unless the tires are tandem duals such as Newmar used in their heavier 5th wheels. Then the dual load limit would apply. For instance, instead of 3042 lbs @ 80 psig in single service, the LT235/85R-16E Michelin XPS Rib is rated 2778 lbs @ 80 psig in dually service, but you have 4 tires/axle x 2 axles = 8 tires, so 8 x 2778 lbs would be 22,224 lbs.

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Old 02-11-2013, 01:20 PM   #16
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What's the formula for tire load limits on a tandem axle setup?
Tandem axles with single tires (not duals) use the single tire column in the load/inflation tables. Or the weight rating in the tire specs for single tires, not duals. So the same as on a pickup with single rear wheels(SRW)

Example: Michelin XPS tires are often used as tires on a pickup as well as tires on a trailer. They are rated as a truck tire for all positions, including trailer axles. For size LT235/85R16, the weight rating for single tires is 3042 pounds @ 80 PSI for use on single wheels, and 2887 pounds @ 80 PSI for tires mounted on dual wheels. So unless the tandem axles on your trailer have dual wheels on each axle, then you'd use 3042 as the max weight that tre can handle on a tandem-axle trailer.
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Old 02-11-2013, 01:22 PM   #17
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Originally Posted by SmokeyWren View Post
Tandem axles with single tires (not duals) use the single tire column in the load/inflation tables. Or the weight rating in the tire specs for single tires, not duals. So the same as on a pickup with single rear wheels(SRW)

Example: Michelin XPS tires are often used as tires on a pickup as well as tires on a trailer. They are rated as a truck tire for all positions, including trailer axles. For size LT235/85R16, the weight rating for single tires is 3042 pounds @ 80 PSI for use on single wheels, and 2887 pounds @ 80 PSI for tires mounted on dual wheels. So unless the tandem axles on your trailer have dual wheels on each axle, then you'd use 3042 as the max weight that tre can handle on a tandem-axle trailer.
That's real clear- thanks!
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Old 02-11-2013, 01:32 PM   #18
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For size LT235/85R16, the weight rating for single tires is 3042 pounds @ 80 PSI for use on single wheels, and 2887 pounds @ 80 PSI for tires mounted on dual wheels.
I believe 2887 lbs in dual service is a typo. HERE is the Michelin XPS Rib spec sheet showing 2778 lbs @ 80 PSIG as the load limit for an LT235/85R-16 in dual service.

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Old 02-11-2013, 05:16 PM   #19
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I believe 2887 lbs in dual service is a typo.
Yep. But somebody has to keep you moderators on your toes, and they appointed me.
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