Can Trailer With ST145/R12 Tires be Upgraded to 13 Inch Tires

Question

Question:

I have a jayco popup 12ud with 145r12 e tires. Finding this size in stock is almost impossible. Its a special order tire everywhere i call. Can i up size to a 13 and if so what tire would i go to? Its a 5 bolt rim.

asked by: Chester Z

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Expert Reply:

We have ST145/R12 trailer tires with a load range E, the Kenda Karrier S-Trail # AM10140. If you wanted to go to a larger tire and wheel you could do so but you would need to ensure you have the needed clearance of about three inches from your trailer tire to rim and four inches to your trailer frame.

A ST145/R12 tire like the Kenda Karrier S-Trail # AM10140 measures 21.3 inches in diameter when inflated and is 5.7 wide. The smallest 13 inch tire is ST175/80R13 quite a bit bigger, measuring 24.1 inches in diameter and 7 inches wide.

If so, and if you have a 5 on 4-1/2 inch bolt pattern there are a number of options available for this tire with different styles of wheel (if you are unsure of your exact bolt pattern you can refer to the linked help article which details exactly how to determine your bolt pattern).

For a ST175/80R13 tire, a load range D will have a capacity of 1,610 lbs, similar to the capacity of 1,520 lbs the Kenda Karrier S-Trail # AM10140 has.

Your options for a ST175/80R13 tire with a load range of D and wheel with a 5 on 4-1/2" bolt pattern are:
- Karrier ST175/80R13 Radial Trailer Tire with 13" White Wheel # AM31985

- Karrier ST175/80R13 Radial Trailer Tire w/ 13" White Mini Mod Wheel # AM31991

I have added links to some video reviews of these tires and wheels for you to take a look at.

expert reply by: Kyle S

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Answer 1

The 12 inch tires that we carry are rated for 65 miles per hour. Any faster than that for extended periods and the excessive heat build up will cause tire failure. To get a tire with a higher speed rating you would have to go up in size. That also…

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Answer 2

I can end this debate for you real fast! Trailer tires, which will have an ST in front of the size, should always be inflated to the maximum psi indicated on the tire. Trailer tires usually do not have a recommended and maximum psi indication so I…

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Answer 3

We recommend that all trailer tires be inflated to the max psi stated on the sidewall of the tire. If the tire is under inflated, the weight capacity is lowered to an unknown amount for that tire. Although running lower air pressures can improve…

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Answer 4

The correct torque for installing lug nuts on your 5 X 8 trailer&#39;s 5-lug wheels will depend on the size of the lugs. For a 1/2-inch lug the torque spec ranges from 75- to 85-ft-lbs. For a 9/16-inch lug the torque spec ranges from 135-…

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Answer 5

Torque specs for wheel lug nuts will vary depending on the diameter of the lugs, type of lug nut and the wheel&#39;s material. The linked chart details the recommended torque for many combinations. Dexter Hub/Drum #84546UC3 has 1/2-inch…

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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

There are different sized tires that are going to fit on both 12 inch and 13 inch wheels so I will give you the diameters of those. For a tire that fits on a 12 inch wheel that is size 145/80-12 such as the Kenda Karrier #AM10130, it will have a…

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Answer 8

As long as you have the needed clearance for the larger wheel and tire with part #AM32156 it would work just fine. It's going to be right at 5 inches taller than what you have and 3 inches wider. Keep in mind you want at least 1 inch between…

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Answer 9

I recommend using the Taskmaster 4.80R12 Radial Trailer Tire #TT48012C on your jet ski trailer. This will upgrade you to a radial tire which will perform much better on the road and give you a longer tread life. I do not like going to a larger tire…

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Answer 10

The closest radial tire size I would have to replace the 4.80-12 bias tire size is the Kenda Karrier S-Trail ST145R12 Radial Trailer Tire #AM10130. The 4.80-12 bias tire is 20.7 inches tall and 4.9 inches wide. The 145R12 radial tire is 21.3 inches…

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Answer 11

You do indeed have a 12 inch rim. When you measure the diameter of the wheel, you'll need to measure the diameter of he wheel where the tire bead meets the wheel. I've provided you a cutaway diagram of a wheel showing where the…

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Answer 12

Since your Carry-On 5' x 8' Utility Trailer has a 2000lb GVWR it more than likely has a 2000lb axle and would need a hub that uses either inner and outer bearings #L44643 or #L44649. I know on The 5' x 8' Carry-On…

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Can Trailer With ST145/R12 Tires be Upgraded to 13 Inch Tires

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