Will Higher Rated Tires Increase My Trailer's Weight Capacity

Question

Question:

The camper is 3500 pounds gross vehicle weight the gross axle weight rating is 3200 pounds my tires the 175 80 R-13 R rated at 1610 lbs. What tire can I purchase so I could hold a little more weight?

asked by: Ms W

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Expert Reply:

Trailer manufacturers design trailers for a maximum weight capacity. This capacity is determined by all the parts of the trailer including the axles, wheels and tires, frame, etc. Increasing the capacity of one of these components (like the tires) will not increase overall capacity. Because of these limitations, it is not easy to increase the weight capacity of your trailer from its maximum capacity of 3,500 lbs.

A great tire that I recommend is the Karrier ST175/80R13 Radial Trailer Tire Item # AM10210. It is a radial, special trailer tire that has excellent traction and provides a smooth ride in wet and dry conditions. It fits 13-inch wheels and has a maximum load capacity of 1,610 lbs at 65 psi. Like your current tires, this tire is rated at the maximum weight capacity of your rig.

Let me know if you have any other questions and links with more information are attached.

expert reply by: Brint H

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Answer 1

The largest diameter wheel we carry with a 4 on 4 bolt pattern is a 13 inch wheel. The largest tire for a 13 inch wheel is an ST185/80-13 tire, part #AM1ST79, which you can then put on a 13 by 4-1/2 inch wheel, part #AM20242. It has an outer diameter…

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Answer 2

A trailer tire size 175/80-13 will replace either an A78-13 or B78-13 trailer tire. A 175/80-13 is going to have 3 load ratings: B at 1,100 pounds at 35 psi, C at 1,360 pounds at 50 psi, and D at 1,610 pounds at 65 psi. This size will have a diameter…

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Answer 3

The B78-13ST is an obsolete tire size that's no longer used. A 175/80-13 is the closest modern tire size. The #AM10210 tire you looked at is a 175-80-13 with a D load range radial tire that has a 1,610 lb capacity at 65 psi. You'll want to…

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Answer 4

We offer a direct replacement for your current 45A Parallax/Magnetek 6345 Power Center. The Progressive Dynamics Replacement Converter, part #PD4645V is exactly what you'd need. I've linked to a product description video for the #PD4645V…

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Answer 5

The highest rated 13" trailer tires we offer are the Kenda Karrier ST185/80R13 Radial Trailer Tire part #AM10208 which have a load range d rating suited for use up to 1,710 lbs. These are radial tires which is best for highway travel. They will…

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Answer 6

Yes, you can run a 175/80-R13 tire on a trailer that came with a 175/80-D13 tire. The only difference between the two is that "R" stands for radial ply and "D" stands for diagonal. For a replacement 175/80-R13 tire, I recommend…

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Answer 7

If your goal is to upgrade your boat trailer tires for safe travel on longer trips you may be able to do so without having to change your wheel/tire size or your hubs. If you refer to the linked page you will see all tire and wheel/tire items in your…

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Answer 8

Yes, it is possible to use radial tires instead of bias ply tires which came on your trailer. A radial tire flexes more than a bias ply and will give you better ground contact, traction, stability, and tread wear. A radial tire will also normally run…

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Answer 9

We can get you pretty close to what you are looking for, but for a 16 inch tire, the highest load capacity is the Provider ST235/85R16 Radial Trailer Tire - Load Range G #TTWPRG235R16 which has a 4,400 lb capacity (per tire) when inflated to its max…

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Answer 10

The highest Load Rating we offer in your size of ST175/80-13 is a Load Range D like the part #AM10210 which has a 1,610 lbs at 65 psi rating. I attached a review video for you to check out as well. This tire is a radial which would be an improvement…

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Answer 11

In order to determine the torque rating for the lug nuts on your trailer you will need to know check out the chart I attached that shows all of the torque specs for all the trailer lugs available based on stud size, wheel material and wheel size.

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Answer 12

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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