Option to Replace 155/80-13 Size Trailer Tires

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Question:

Hello. I need to replace the tires on my boat trailer. The original tires are ST155/80R13 Load Range B tires. I cannot find ST155 tires and I am afraid a ST175 would rub the frame. Which would be a better option, ST145R12 or 5.30-12 size, or something else?

asked by: Paul R

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Expert Reply:

If you go up to 175/80-13 sized tires, like # they will be about 1-1/2 inches larger in diameter and about 1/2 inch wider. You want at least 3 inches between the tread and fender and an inch between the sidewall to the inside of the wheel well. If you have the clearance it will be better to go with the larger tire than the smaller.

If you go down to the 145/R12, like # AM35354, or the 5.30-12 like # AM35354, you'll have tires that are about an inch smaller in diameter and about a 1/2 inch thinner.

If going with the smaller size is your only option because of clearance I would stick with the radial tires instead of going with bias tires. Radial tires run cooler and lasts longer than a bias tire will.

expert reply by: Charles S

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Answer 1

The tire size you have is not designed for use on a trailer as it's a passenger vehicle tire size. That's actually what the "P" in the tire size references. You want a tire size that starts with ST which means it's for a trailer…

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Answer 2

The 155/80-13 tire you are referring to is a very odd size which is why you are having such difficulty finding a replacement. We do not carry a tire in this size but I do still have an option for you. A 155/80-13 tire is going to be 22.8" in…

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Answer 3

I have a solution for you, but the tire size you are looking for is no longer available. Instead the next closest size would be the 175/80R13 which will be right at 1.4 inches taller. As long as you have room for 3/4 of an inch more sidewall in your…

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Answer 4

A 5.30 X 12C tire is going to be your best replacement. If you need the 4 on 4 inch bolt pattern #AM30780 is a good option, or #AM30820 for the 5 on 4-1/2 inch bolt pattern. These both have the wheel and tire included, which you'll need, since…

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Answer 5

I have several options to upgrade 4.80-12 wheel/tires on a trailer without replacing hubs, ranging from 13" - 15". The best option will really come down to how much space you have available and this will be different for each trailer. The…

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Answer 6

Because the size of both tires is so similar, you can certainly use the #AM31952 as a replacement. An ST185/80-13 tire will typically be slightly larger in diameter and width than an ST175/80-13 tire, but only by around 1/4 inch. Although the…

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Answer 7

By looking at the photo you provided, I can see that you do indeed have a clearance problem with the fender. Going to a 13 inch wheel/tire combo like the Kenda Wheel/Tire Combo part #AM31990 for a black mod wheel or #AM31991 for a white mod wheel…

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Answer 8

A 4.80-12 trailer tire measures 20.7" dimeter x 4.9" wide. In order to upgrade to a 175/80-13 you'll need an extra 1.65" diameter x .85" wide of space. We recommend you have at least 3" on top of the tire and 1"…

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Answer 9

An ST145/R12 tire like the Kenda Karrier S-Trail #AM10140 measures 21.3 inches in diameter when inflated and is 5.7 wide. The smallest 13 inch tire is ST175/80R13 quite a bit bigger, measuring 24.1 inches in diameter and 7 inches wide. You'll…

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Answer 10

For a tire to replace the 145/R12 size tires currently on your trailer, I recommend the Kenda Karrier S-Trail Radial Trailer Tire #AM10130. This is a great radial trailer tire that has a 1,220 pound maximum load at 65 psi. Note that this is a Load…

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Answer 11

The two tire sizes are similar, but the 145/80-12 will be a bit taller at 21.3 inches vs. the 4.80-12 which has a diameter of 20.5 inches. Aside from that they are very similar and both fit 12 inch diameter rims that are 4 inches wide. The radial…

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Answer 12

The 155Rx13 tire is an older size that's not used much at all anymore, which is why you're having so much trouble finding an exact replacement. Because of this your best option is to replace the tires with the closest current/modern trailer…

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Option to Replace 155/80-13 Size Trailer Tires

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