Replacement Trailer Tire for an Old A78-13 Tire

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Question:

What is the replacement size for A78-13St

asked by: Elaine

0

Expert Reply:

The metric equivalent of an A78-13 tire is a 175/80-13. This size is available in load range B, # AM1ST74, rated for 1,100 pounds at 35 psi.

It also comes in load range C, # AM1ST76 for bias ply or # AM10199 for radial, both rated for 1,360 pounds at 50 psi.

And there is also a load range D in this size, # AM1ST77, for bias ply and # AM10210 for a radial both rated for 1,610 pounds at 65 psi.

Radial tires run cooler and track better than bias ply tires but bias ply tires are better for off-road applications. I have included a link to our articles on tire sizes and trailer tires in general.

expert reply by: Michael H

0

Answer 1

The modern metric equivalent to tire size A78-13 is going to be a 175/80-13. You won't be able to use any of the tires we carry though because they are for trailer use only. There is a difference between the way trailer tires are…

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Answer 2

The replacement size for the A78x13ST original tire is the ST175/80-13. The overall diameter is 24.1 inches and the overall width is 7 inches. You might want to measure on your trailer to make sure you have the clearance for the ST175/80-13 size.…

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Answer 3

We offer trailer wheels, and some wheels with tires already mounted, in several 5-lug bolt patterns: 5 on 4-1/2 Inch 5 on 4-3/4 Inch 5 on 5 Inch 5 on 5-1/2 Inch By far the most common bolt pattern is the 5-on-4-1/2. This means that the 5 lugs are…

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Answer 4

I have two options for you to raise your trailer and gain more clearance between the fender and tire. The most cost effective option would be to flip the axles with a Dexter Trailer Springs Over-Under Kit part #K71-384-00 or part #K71-385-00. That…

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Answer 5

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…

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Answer 6

A 5.30 X 12C tire is going to be your best replacement. If you need the 4 on 4 inch bolt pattern #AM30780 is a good option, or #AM30820 for the 5 on 4-1/2 inch bolt pattern. These both have the wheel and tire included, which you'll need, since…

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Answer 7

For a single axle trailer, you want the shackle strap to be able to move so that you have the spring deflection needed for your suspension. Angled like the photo or even almost vertical is fine you just don't want the shackle strap to bind and…

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Answer 8

You can mount trailer axles above or below the leaf springs. The difference is just the amount of ground clearance that the trailer would end up having. The biggest advantage with the spring below the axle (trailer will be lower) is that you would…

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Answer 9

The A78-13 is an old numbering system for tires that isn't used any longer. The compatible modern tire size is 175/80-13. The #AM3S030 bias tire you'd looked at would work fine, but I'd recommend going with a radial tire in that size,…

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Answer 10

I would be happy to help! Based on the BT150 stamped in your hub you will need the CE Smith Trailer Idler Hub Assembly #CE13315 which includes inner and outer bearings #L44649. This hub comes pre-greased and ready to install on the spindle of your…

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Answer 11

The easy answer is that as long as there's an "ST" in front of the tire size it's going to be totally fine and safe to use on a camper trailer. That said, a 175/70-13 tire size is not a standard trailer size so most likely what you…

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Answer 12

Most likely what you'll want is a wheel and tire combo like the part #AM3S130 which is a tire size of ST175/80-13 mounted on a wheel with a 4 on 4 inch bolt pattern. But we do need to verify your bolt pattern is 4 on 4 inch. Could I get you to…

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Replacement Trailer Tire for an Old A78-13 Tire

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