What Size Radial Tires to Replace Existing B78-13ST Load Range B Tires on Boat Trailer

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Question:

I currently have B78 13ST Load range B on my trailer. FRom what I have read I think I would be better off with a radial tire. Will you tell me the tire size I should purchase. Should I also replace my non-radial spare? Thank you

asked by: Bill C

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Expert Reply:

The B78-13 tire you have corresponds to a ST175/80-13 tire size. Radial tires are an excellent choice. They tend to run cooler than bias-ply tires, which will lead to longer tire life.

If you are needing the tire only, we offer that size in a radial load range D (1610 lb capacity @ 65 psi) or a load range C (1360 lbs @ 50 psi). The load D tire is part # AM10210, the load range C tire is part # AM10199.

If your present wheels have a 5 lug on 4-1/2 inch bolt circle, we offer a load range D radial tire on a galvanized wheel, part # AM31994 or a load range C # AM31952.

If your bias-ply spare is still in good shape, you can continue to use it but I wouldn't recommend using it for anything other than emergency use.

Keep in mind, these tires measure 24.1 inches in diameter and 7 inches wide. When upgrading to modern size tires, be sure you have enough room in the wheel well to accommodate this tire size.

expert reply by: Mike L

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Answer 1

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 2

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 3

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 4

There is only one difference between the Curt Trailer Hitch Receiver #C13176 and etrailer Trailer Hitch Receiver #e98909 that fit your 2020 Chevrolet Colorado, which is the finish. The Curt trailer hitch has a glossy black finish while the etrailer…

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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

The OEM prep package consists of 4 "pucks" in the bed of the truck that will allow you to drop in puck style hitches for easy installation and removal, that gives you a completely clear bed when not in use. The B&W Companion OEM 5th…

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Answer 7

I definitely understand being a bit overwhelmed by the amount of options in front of you, however I can definitely help with differentiating the trailer hitches for your 2019 Subaru Outback Wagon along with explaining my personal recommendation,…

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Answer 8

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 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

Class I and Class II hitches both have a 1-1/4 inch receiver opening. The difference is that a Class I hitch has a lower tongue weight rating, usually 200 pounds and a lower towing rating, usually 2,000 pounds. A Class II hitch usually has a tongue…

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Answer 11

You will have to go with a sliding hitch to allow the trailer to make tight turns. For a trailer 8 feet wide the only bed length that's going to allow 90 degree turns without a slider is a stationary hitch. That being said you have two options.…

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Answer 12

I did some checking and the hub/drum we offer that will work for you is the part #8-430-5UC3. This uses the same bearings as the 8-415 and will be an exact fit aside from the fact this is a non-ABS setup and the 8-415 came in an ABS setup and non-ABS…

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What Size Radial Tires to Replace Existing B78-13ST Load Range B Tires on Boat Trailer

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