How to Determine Trailer Tire Weight Capacity

Question

Question:

hi I am trying to fit our a trailer frame which has been made for me to fit two disabled buggies. What my question is how do I know if the wheels fitted are ok for the job. Is there a weight gauge or something Any help with this would be great fully received because I am struggling.

asked by: Becky T

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Expert Reply:

On the sidewall of the tires there should be a weight capacity listed as well as an air pressure maximum value. Trailer tires should always be inflated to their maximum tire pressure otherwise the capacity of the tire diminishes when below max psi.

Wheels can be a bit harder to determine the capacity. However, most of the time the wheels will have higher capacities than the tires. So if the tire capacity is good the wheel capacity should be good as well. If you can track down a manufacturer or a part number on the wheel you can look up the capacity that way as well. On the back side of the rim there may be a sticker or plate that has the capacity or part number listed there.

I attached a help article on trailer tires for you to check out as well.

expert reply by: Jameson C

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Answer 1

Although we offer some wheel/tire combos that are mounted at the factory, we do not have the equipment to mount tires on wheels. If you purchased the #LHSJ211G wheel and the #AM10235 tire, you'd receive the wheels and tires un-mounted. You'd…

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Answer 2

The difference between an load range C and load range D tire in the same size is the capacity and psi rating. The two tires will still have the same dimensions and fit on the same wheel. The D rated tire has a higher capacity. For a ST175/80D13 like…

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Answer 3

You can add larger wheels and tires to a trailer as long as you have enough room for the larger size. The main clearance issues we find when putting larger tires and wheels on a trailer is from the top of the tire to the fender and from the inside…

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Answer 4

The 12 inch tires that we carry are rated for 65 miles per hour. Any faster than that for extended periods and the excessive heat build up will cause tire failure. To get a tire with a higher speed rating you would have to go up in size. That also…

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Answer 5

Yes, the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire #AM10140 referenced in your question will fit the same 12 inch wheel with a 4 inch width that your existing 4.80-12 size tires are mounted to. Just note that the ST145/R12 tire will be…

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Answer 6

The closest radial tire size I would have to replace the 4.80-12 bias tire size is the Kenda Karrier S-Trail ST145R12 Radial Trailer Tire #AM10130. The 4.80-12 bias tire is 20.7 inches tall and 4.9 inches wide. The 145R12 radial tire is 21.3 inches…

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Answer 7

The difference between the two trailer sizes you referenced is that the 5.30-12 will be about 1-1/2 inches taller than the 4.80-12 and would have more capacity. As long as your trailer has the clearance for a slightly taller and wider tire a 5.30-12…

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Answer 8

We have verified with Kenda that the tire of the Kenda Karrier ST145/R12 Radial Trailer Tire with 12" Black Mod Wheel #AM35354 that you referenced has an 81 mph speed rating.

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Answer 9

Yes, but not by much. The ST145R12 tire size is 5.7 inches in width whereas the 5.30-12 is 5.6 inches wide.

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Answer 10

Since both a ST145/R12 size tire, like the Kenda Karrier S-Trail #AM10130, and a 5.30-12 size tire, like the Kenda K353 #AM10068, fit a 12 inch wheel, a ST145/R12 size tire can replace a 5.30-12 size tire. Keep in mind that these tires do have…

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How to Determine Trailer Tire Weight Capacity

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