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Old 11-16-2014, 08:51 PM   #1
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Tires, tires, tires

There always seems to be a thread about tires. Iíve read them all. Tires, Tires, Tires, ST vs LT. One can read the side wall and learn the tireís maximum weight load capacity range at cold air pressure. My question is, how do you determine the actual weight each tire is holding up? What formula do you use? I know what my "dressed out" RV weighs, I know what my "dressed out" TV weighs. How do I determine how much weight each tire is carrying? I would think that info would be helpful in determining the load range of a tire.

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Old 11-16-2014, 09:18 PM   #2
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Trailer weight minus tongue weight divided by the number of trailer tires.
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Old 11-16-2014, 09:25 PM   #3
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That is assuming that the load is well balanced. If not, it is possible that some wheels are carrying more of the load than other wheels.
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Old 11-17-2014, 05:49 AM   #4
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Find you a DOT person with a set of portable scales. That is the only accurate way to see what each tire is carrying. They usually are more than glad to weigh your unit as long as they are not really busy.
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Old 11-17-2014, 06:38 AM   #5
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You can weigh it twice on a CAT scale assuming there is a little room off to the side of the scale. The first time put one side of your rig off the to the side of the scale (i.e. only the tires on one side of your rig will be on the scale) and weigh it with the tires on different platforms. Tell the operator you want separate platform readouts rather than combined. CAT scales often have four separate platforms. Go inside and get the ticket and then pull around and reweigh it the same way except put the other side of the rig off to the side. Tell them it is a reweigh so that the second time it only costs $1 - $2.
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Old 11-17-2014, 07:24 AM   #6
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Quote:
Originally Posted by newbold1 View Post
That is assuming that the load is well balanced. If not, it is possible that some wheels are carrying more of the load than other wheels.
Trailer axles are so close together that the net effect of loading differences is diffrent tongue weights with very little if any load difference to individual tire.
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Old 11-17-2014, 07:38 AM   #7
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Portable scales are the easiest. For me though, I prefer to purchase trailer tires that are vastly oversized for my needs. My current trailer has a 7500 lbs max weight. My tires are rated at either 2600 or 2800 lbs each (I don't remember which). That means that my tires are rated for about 3000 lbs MORE than it weighs. It cost $6 per tire to go up to D weight rating.
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Old 11-18-2014, 04:39 PM   #8
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The reason I ask. I'm going to purchase a set of tires for my 5er before next spring. I've been looking and pricing. I've calculated that each of my RV tires is carrying 2,121 pounds of weight hence, Load Range G tires would be overkill if I'm thinking correct and a waste of money.
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Old 11-18-2014, 05:14 PM   #9
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Shorty Cox, I am into this RV thing for my second year, so am pretty much a newby. I must have read the same threads you did - quite confusing. I settled on looking for tires that would carry 80% of what they are rated for at a maximum. Given that, I also went toward LT tires.

My trailer cm with 15 inch load range D ST tires that the specs say weigh 28 lbs each. I replaced with 16 inch load range E ST tires the specs say weigh 36 lbs each. The new tires are one inch in diameter bigger than original and fit just fine. The new tires are carrying around 78% of their capacity. The cost of the new tires is $145 each versus the cost of the cheapo ST tires the trailer came with at $85 each. Still, the cost compares favorably to the Maxxis trailer tire, the only ST tire I would consider.

I note the trailer tires always run cooler than the truck tires.

That is how I thought through the issue.
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Old 11-18-2014, 05:15 PM   #10
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I meant say that I replaced with 16 inch LT tires, not ST tires.
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