How to Get Wider Tires on Trailer With ST145R12 Tires

Question

Question:

I guess I should say wider as in 8 inch of tread area

asked by: JOEL P

0

Expert Reply:

The 5.7 inch width of a ST145/R12 tire is by far the widest 12 inch tire, so in order to get a wider tire you will need to upgrade to a ST175/80R13 tire, which measures 7 inches wide. This means you will also need new, 13 inch wheels for the tires to fit.

Assuming you have the clearance and you have a 5 on 4-1/2" bolt pattern (if you aren't sure you can use the guide/template I linked below), you simply need to choose the option with the correct load capacity, either C or D:

- Load Range C, 1,360 lbs: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel # AM31952

- Load Range D, 1,610 lbs: Karrier ST175/80R13 Radial Trailer Tire with 13" Galvanized Wheel # AM31994

Then for lug nuts what you will need are the Trailer Wheel Lug Nut - 1/2"-20 - Stainless Steel # KALN1375S.

Finally, please keep in mind that you still need to have at least 3" of clearance from the top of the tire to your fender and at least 1" of clearance between the inside of the tire and your trailer's frame rail.

expert reply by: Kyle S

0

Joel Z.

12/2/2021

I guess I should say wider as in 8 inch of tread area

Kyle S.

12/2/2021

The 13 inch tire and wheels I mentioned have 7 inches of tread, but if you are looking for something wider then you will need to go up to a 14 inch tire and wheel combo: - Provider ST205/75R14 Radial Trailer Tire w/ 14" White Mod Wheel - 5 on 4-1/2 # TTWA14RWM This ST205/75R14 tire and wheel measures 8.5 inches wide and 26.14 inches in diameter.

Answer 1

The two tire sizes you referenced, 4.80-12 and 5.30-12, both fit 4-inch wide rims, but they differ in their overall diameter. A 4.80-12 tire/wheel when fully inflated will have a diameter of 20-1/2-inches while the 5.30-12 size will be just under…

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Answer 2

A ST145/R12 trailer tire like the Kenda Karrier #AM10130 measures 21.3" in diameter and 5.7" wide, and we do have spare tire covers which come in black that fit this size tire. What you need is one of the following spare tire covers: - Adco…

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Answer 3

Hey Joe, thanks for reaching out! The Rambler ST145/R12 Radial Trailer Tire #TA89GR has a 21.3" overall diameter. You'll take half of that diameter and measure from the spindle up to look for fender clearance. What is your motivation for…

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Answer 4

Hey Johnathan, thanks for reaching out. If you want to stick with the 4.80-12 tires we do have the Kenda K353 Bias Trailer Tire - 4.80-12 - Load Range C #AM10062 which is rated for 65 mph. That will be the highest speed rating available for that tire…

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Answer 5

Hey Bob, yes the Rambler trailer tire part #TA89GR that is the size ST145/R12 does fit the same wheel size as what you have now as both fit 4 inch wide 12 inch diameter wheel.

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Answer 6

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 7

Yes, the Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire #AM10140 referenced in your question will fit the same 12 inch wheel with a 4 inch width that your existing 4.80-12 size tires are mounted to. Just note that the ST145/R12 tire will be…

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Answer 8

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 9

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 10

Hey Bryan, that's a good question. The pricing can definitely be misleading, but I wouldn't use it to judge the quality of the tire. A lot of that comes down to promotions, inventory, and whether you're looking at a tire by itself or…

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Answer 11

According to Blue Ox, it'll take an experienced installer about 4 to 5 hours to complete the installation of their #BX1128 Base Plate Kit on a 2016 Jeep Grand Cherokee. The install isn't what I'd call super-difficult, but the installation…

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Answer 12

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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How to Get Wider Tires on Trailer With ST145R12 Tires

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