What is the Diameter of a B78-13 Trailer Tire

Question

Question:

What is the diameter of a B78-13 tire

asked by: Beecher V

1

Helpful Expert Reply:

The B78-13 tire size, the modern equivalent of which is a 175/80-13, has a 24.1 inch diameter. This can vary slightly from one manufacturer to the next so you might see one that is 23.9 or 24.3. I have included a link to our handy tire size help article for you.

expert reply by: Michael H

1

Answer 1

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 2

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 3

The tire size ST175/80R13 is pretty standard, so we can definitely get you replacements for the tires. I suggest going with the Taskmaster Provider ST175/80R13 Radial Tire #TTWTRTM1758013C. These are rated up to 1,360 pounds at 50 psi and also has an…

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Answer 4

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 5

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 6

Even though I cannot comment specifically on the grease you used because I am not familiar with it, I can tell you the best grease for trailer bearings is a a grease with a rating of GC-LB, which just means it is made to withstand very high…

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Answer 7

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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Answer 8

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 9

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 10

Trailer wheel bearings are specific to the spindle that is installed on the axle that is on your trailer. You will need to safely support the trailer, remove the wheel and tire, remove the grease cap, remove the cotter pin and washer that secures the…

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Answer 11

The difference between the Class II and Class III hitches has to do with their Gross Trailer Weight (GTW), their Tongue Weight (TW), and their Hitch Receiver Size. Class II trailer hitch receivers have a 1-1/4 inch receiver and can be rated up to…

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Answer 12

Load range B trailer tires are going to have a lower capacity than C load range tires. Basically that, psi rating, and the ply rating are the only differences. A higher load range tire would last a little longer than lower load ranges of the same…

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What is the Diameter of a B78-13 Trailer Tire

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