What is the Modern Tire Size for H78-15 Trailer Tires

Question

Question:

My tires on my tv are: H78 15st What tires would you recommend. We inherited this trailer from my I laws

asked by: Shawn D

0

Expert Reply:

The modern tire size for the H78-15 tires is 225/75-15. The Karrier ST225/75R15 Radial Trailer Tire, # AM10256, would be a suitable replacement tire. Keep in mind, this is a Load Range D tire which is an 8 ply tire with a load capacity of 2,540 lbs at 65 psi.

I recommend checking the weight capacity of your axles before purchasing a tire. It is important to choose replacement tires that equal or exceed the weight capacity of your axle. Also, it is recommended to replace both tires on an axle at the same time, especially if both of the tires on the axle are H78-15 tires.

expert reply by: John H

0

Brian

3/22/2025

So putting 225/75/15 tires on my camper will be ok instead of the H78-15-st ?

Reply

John H.

3/27/2025

@Brian Yes, they are basically the same size, so you won't have any issues with rubbing or fit. As I mentioned above, you'll want to keep an eye on weight capacities, but other than that they are basically the same size tire. It sounds like you might have an old camper. I'm a fan of vintage campers. What do you have?

Reply

Answer 1

The H78-15ST tire size is the same as the 225/75-15 tire size like the part #TTWSF22515D that you referenced. I would recommend the radial version of this tire #TTWTRTM2257515D over the one you referenced as it is a bias ply. Radial tires run cooler…

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Answer 2

The "JJ" that you mentioned finding on the wheel size listed for the units mounted to your trailer refer to the contour of the bead seat on the wheel, essentially its shape ( "J" indicates the shape of the letter J). This…

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Answer 3

The modern equivalent of the H78-15 tires are tires sized at 225/75-15. A good replacement for your tire in this size is the Kenda Karrier 225/75-15 Radial Tire, part #AM10251. This tire has Load Range of C and is a 6 ply (the lowest we have in this…

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Answer 4

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 5

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 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 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 8

Hello Steve, thanks for reaching out. All of the trailer tires we sell come balanced in the manner that trailer tires are balanced. Every tire and every wheel has a high (heavy) and low (light) spot. The manufacturers offset the high spot on the tire…

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Answer 9

Hello Andrew, Well that sounds like quite the fun trip, what state or states will you be traveling through? You're asking a really important question, especially since you're planning a cross-country trip with about 250 pounds of bikes and…

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What is the Modern Tire Size for H78-15 Trailer Tires

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