Metric Tire Size to Replace B78-13ST Boat Trailer Tire

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Question:

what tire will replace a B 78 - 13ST

asked by: Andy

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Expert Reply:

A tire of size B78-13ST can be replaced with the metric trailer tire size ST175/80-13 which has the same overall diameter of approximately 24-inches when mounted and inflated. Both of these tire sizes will fit on a 13-inch rim with widths of either 4-1/2-, 5- or 5-1/2-inches.

We offer ST175/80-13 tires in three load ranges, B, C, and D, which have weight ratings of 1100-, 1360- and 1610-lbs, respectively. All tires and wheel/tire combination products in this size are displayed on the linked page.

In addition to varying weight load ratings these tires also have differing speed ratings. If we do not indicate a specific speed rating in the tire specs this means it is rated for 65-mph.

Special trailer tires should always be inflated to their maximum rated cold tire pressure as indicated on the sidewall. It is never appropriate to under- or over-inflate a trailer tire for any reason.

The two linked articles may be of help to you as you make your selection.

expert reply by: Adam R

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Answer 1

I can end this debate for you real fast! Trailer tires, which will have an ST in front of the size, should always be inflated to the maximum psi indicated on the tire. Trailer tires usually do not have a recommended and maximum psi indication so I am…

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Answer 2

The correct replacement size for a B78-13ST is a 175/80-13. For this, I recommend the Provider ST175/80R13 Radial Trailer Tire part #TTWTRTM1758013C which is an excellent radial ply option that will run cooler. It also has an 81 mph and two-year…

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Answer 3

I believe you mean Load Range since the Load Ranger was the unsuccessful brother of the Lone Ranger. For any given tire size there can be different load ranges. The different load ranges have different weight capacities. This has to do with the…

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Answer 4

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 5

Loadstar ST185/80D13 Bias Trailer Tire #AM3S331 is a bias ply construction whereas the 185/80R13 you have is a radial tire construction. The difference is how the plies run inside the tire. You would want to keep the construction type the same on the…

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Answer 6

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 7

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 8

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 9

I have attached a couple of helpful articles that have frequently asked questions about tires and trailer tire sizing you can check out. As the chart shows, the widest 13 inch tire we carry is the 185 as you said you currently have.

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Answer 10

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 11

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 12

The 5.30-12 tires, being wider, are going to make more contact with the road. This means that the noise, and heat build up will be higher than a 4.80-12 tire but the rolling resistance will actually be less because the tire is larger diameter. The…

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Metric Tire Size to Replace B78-13ST Boat Trailer Tire

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