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


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.


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 with 13" Aluminum Wheel # AM31998
- 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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