Trailer Tire Replacement for Size A-78-13

Question

Question:

I have a 1976 Ranger bass boat a real classic. The trailer has A-78-13 tires on 13in wheels, they are mounted with 5 lug bolts. I would like to go to st205/75R 14 in wheels. The center hub hole is smaller on the 13in rims than the 14in rims. It looks like the 5 hole pattern for the 13and14in rims are the same. I dont want to buy new rims and tires if they wont work. Will the lug bolts vs. Lug studs and nuts be a problem? And will the larger hub hole on the 14in rims be a problem? I would much appreciate your expertise... Thanks

asked by: Roger

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Expert Reply:

Since your trailer uses lug bolts to secure the wheels to the hubs that means the hubs are hub-centric which means that the pilot hole of the wheel is what centers the wheel to the hub. To replace wheels you'd have to go with wheels that have the exact same pilot diameter as what you currently have so that it centers properly. We can help you replace just the tire though.

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: Jameson C

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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…

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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

While we may have an option for you, we do not have the exact specs on your Allis grease seal part number 5013 29772. However, with the 1.6" ID and 2.5" OD measurements you provides, that is very close to our #58846. This particular…

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Answer 4

A 4-Way trailer connector has the basic lighting functions only; running lights, left turn signal and brake lights, right turn signal and brake lights, and ground. A 7-Way has these functions and a 12 volt circuit, a circuit for electric trailer…

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Answer 5

From what I could find it looks like your 122R (red) and 122Y (amber) lights measure 3.75" x 1.70" x .81". We don't have any replacement lense directly for the GLO-BRITE lights but we do have some similar lights that you could use…

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Answer 6

You will need the Red LED Trailer Clearance or Side Marker Light #328-K-52 or Amber LED Trailer Clearance or Side Marker Light #328-K-51 for your 2018 Forest River Sunseeker motorhome. These lenses have the same Top Command SAE-AP2-16 markings on the…

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Answer 7

If your current springs have 5 leaves then going to a 7 leaf spring will increase the height of the trailer a little and make the trailer more susceptible to sway. Regarding capacity if you go with springs rated higher than what is required it will…

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Answer 8

If you are needing the hub and drum assembly then you will want to go with the Dexter Trailer Hub and Drum Assembly #8-201-5UC3-EZ but if you are just looking for an idler hub then you will want part #8-213-5UC1 instead. These come with the correct…

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Answer 9

The 7290 that you see is a casting number. It is found on AL-KO hubs that fit #99 spindles. I found that the bearings used are #28580 which would be the inner bearing and #25580 which would be the outer bearing. For the seal use #91030.

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Answer 10

I agree it is the right time to upgrade to a Lithium charger/converter as not all are Lithium compatible. I recommend using the Progressive Dynamics Mighty Mini AC/DC Panel and Converter/Smart Charger - 60 Amp #PD4060K which is a replacement for your…

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Answer 11

I checked with Curt and they do show the Curt Trailer Hitch Receiver part #C13233 as a fit for a 2022 Volvo XC90 All Models which includes the Recharge.

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Answer 12

I've never heard of an actual third brake light connector on a camper shell to plug in on a truck and we don't carry any parts to do that. The light generally needs to be hardwired into the truck's brake light circuit. The issue with this…

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Trailer Tire Replacement for Size A-78-13

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