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Old 09-02-2015, 11:51 AM   #1
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tire pressure

The max load rating on tires on my mac 226 tent trailer are 1600 #. Trailer weight is about 1800 #. Is the max tire load multiplied by two tires? Meaning the tires on the trailer are good for 3200#? These tires came on the trailer so I assumed they are adequate. What would be a good tire pressure to use?
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Old 09-02-2015, 11:56 AM   #2
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Yes, 1600 lbs each. Two would be 3200 lbs.
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Old 09-02-2015, 01:18 PM   #3
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Originally Posted by Dragonfly213 View Post
The max load rating on tires on my mac 226 tent trailer are 1600 #. Trailer weight is about 1800 #. Is the max tire load multiplied by two tires? Meaning the tires on the trailer are good for 3200#? These tires came on the trailer so I assumed they are adequate. What would be a good tire pressure to use?
I recommend max pressure as stated on tire side wall. Some argue not necessary, however been my experience max pressure is way to go.
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Old 09-03-2015, 11:03 AM   #4
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The tongue weight is also subtracted from the max load.

My 228 has a GVWR of 3100 with a dry tongue weight of 350, and the original tires were rated for 1360 each
1360x2 = 2720
2720 + 350 = 3070

So technically, they shipped the trailer with a chance of going 30 lbs over tire ratings.

One reason why I yanked those lawnmower tires off the trailer, had it lifted and installed 15" tires that are rated at 1653 each.
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Old 09-03-2015, 11:18 AM   #5
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I disagree with blanketly going with max pressure as stated on the sidewall. Any major tire manufacturer has a load chart on their website. Weigh your unit and apply that to the chart. There's no need to further jar the crap out of things due to a rock hard tire. My truck tires say 80 psi, but the door sticker says 60 psi. If I pump them up to 80 psi, my truck gets really squirrly on the road and wears the center of the tire out way faster than the edges.
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Old 09-03-2015, 12:51 PM   #6
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Hi there are reasons to not run your tire pressure at full working load pressure if you have a tire that is rated higher than the load it carries but still want the stability and safety of a higher load range.

1. At full rated tire inflation pressure the tire my not have full contact with the road due to vehicle not having enough wight to push the tire flat on the road surface. Learned this one the hard way when I wore out the center tread of the tire in 8000 mile on my dully tires. The tire will crown and the tire center will only have contact with the road.

2. You need to inflate the tire to meet or just exceed the load the tires are carrying and not have excessive side wall flex that will break down the cords or wires in the side walls and create excessive tire heating. The right pressure for the load will keep the tire in full contact with the road surface.

Hope this helps Tim
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Old 09-03-2015, 01:13 PM   #7
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Originally Posted by TimVWulp View Post
Hi there are reasons to not run your tire pressure at full working load pressure if you have a tire that is rated higher than the load it carries but still want the stability and safety of a higher load range.

1. At full rated tire inflation pressure the tire my not have full contact with the road due to vehicle not having enough wight to push the tire flat on the road surface. Learned this one the hard way when I wore out the center tread of the tire in 8000 mile on my dully tires. The tire will crown and the tire center will only have contact with the road.

2. You need to inflate the tire to meet or just exceed the load the tires are carrying and not have excessive side wall flex that will break down the cords or wires in the side walls and create excessive tire heating. The right pressure for the load will keep the tire in full contact with the road surface.

Hope this helps Tim
And how do you determine the correct pressure for the load carried?

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Old 09-03-2015, 11:07 PM   #8
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What would be a good tire pressure to use?
Whatever the tire placard says.
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Old 09-03-2015, 11:43 PM   #9
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I disagree with blanketly going with max pressure as stated on the sidewall. Any major tire manufacturer has a load chart on their website. Weigh your unit and apply that to the chart. There's no need to further jar the crap out of things due to a rock hard tire. My truck tires say 80 psi, but the door sticker says 60 psi. If I pump them up to 80 psi, my truck gets really squirrly on the road and wears the center of the tire out way faster than the edges.
Talking about pressure in trailer tires, not your truck tires which very seldom if ever get even close to max weight for the tires. Trailers are all much closer to max weight for the tires. Two totally different animals.
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Old 09-04-2015, 12:15 AM   #10
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What would be a good tire pressure to use?
Max pressure molded into the sidewall. You won't find load charts for many of the tires installed as OE on RVs.
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