Converting Tire Size For Bias-Ply Tire To Metric

Question

Question:

What is the conversion of boat trailer tire 5.30 X 12 bias to radial metric? What are the benifits from switching from bias to radial on my boat trailer tires. My single axle boat trailer carries less than 1000 lbs. Thanks

asked by: Denny R

0

Expert Reply:

The number 5.30 on your tire is the section width of the tire which means the tire is 5.3 inches wide.

For a comparable radial tire for your boat trailer you can use a tire like part # AM10130. This tire measures 5.7-inches wide. The # AM10130 tire is what I recommend if you switch to a radial tire for your boat trailer. You can calculate the size of the tire width by multiplying the first number of a radial tire by .03937. In this case, the # AM10130 is and ST145/R12. Multiply (145 x .03937). I have attached links to a couple of helpful articles that explains the difference between bias-ply and radial tires and how to measure tires.

A radial tire will run cooler than a bias-ply tire because it has more flex and that gives it better traction and stability. A bias-ply tire has stiffer sidewalls which works better for off-road use.

expert reply by: Jeffrey L

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Answer 1

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 2

That's a good question, and the answer is that your current 5.30-12 tires are not safe for traveling at highway speeds. What you likely have on your trailer now is a bias ply tire, which is not good for highway use because they are stiffer…

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Answer 3

To add a 2" hitch to your 2023 Kia Soul, I recommend the Draw-Tite Trailer Hitch item #DT25GR. This hitch is custom fit and bolts to your Kia with included hardware. It will not fit the 1.6L Turbo model. I really like this hitch because…

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Answer 4

For load rang H tires we only have those in the 17-1/2 inch size. If there is room enough above the tires you have now to go to the taller size then you certainly could as long as you have an 8 on 6-1/2 bolt pattern. The tires and wheels in this size…

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Answer 5

A 155/12 tire will be about 6.1 inches wide. The closest match is a 145/12 at 5.7 inches wide. I have included a link to all of the tires and tire/wheel combos we have in this size. A 155 isn't a trailer tire size (unless it has an ST in front of…

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Answer 6

Radial type special trailer tires will tend to run smoother (and cooler) than bias ply tires since they offer more flex and better ground contact, thanks to their softer side walls. However passenger car tires should not be used on any trailer…

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Answer 7

You do indeed have a 12 inch rim. When you measure the diameter of the wheel, you'll need to measure the diameter of he wheel where the tire bead meets the wheel. I've provided you a cutaway diagram of a wheel showing where the measurement…

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Answer 8

The most common tire size people go to from the 4.80-12 is the 5.30-12 like the Taskmaster 5.30R12 Radial Trailer Tire #TT53012C. This will give you a width increase of 1/2 inch and a diameter increase of 1.4 inches. This tire also has a speed rating…

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Answer 9

For a 4.80-12 trailer tire, the overall diameter or height is 20.5 inches. For a 5.30-12 it is 21.9 inches. That is a difference of 1.4 inches but you will only see half of that, 0.7 inches, in added height. Please keep in mind that going to a taller…

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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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Answer 11

If your hub ever made hard contact with a curb or something similar then it is possible that the center bore isn't true anymore. It is also possible that the cap was not driven in evenly. That coupled with centrifugal force will cause it to fall…

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Answer 12

We definitely carry those! For those parts, you need 2x of the #RG04-080 and 1 of the #DC250L-DCRP. I went ahead and attached helpful demo videos of these products for your convenience.

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