Comparing Trailer Wheel and Tires in Size ST145/R12

Question:

My Carry On 5x8 utility trailer came with 4.8x12 bias tires. It’s time to replace them and I’d like to upgrade to radial tires. It appears that ST145/R12 and 5.30R12 are both suitable replacements for my 5 on 4 1/2, 12”x4” rims. I looked at your tire/rim combos of AM31202 and but can't find one for the ST145/R12 size. Other than slight differences in load capacities E vs D are there additional performance differences to consider? Which of the two is better? I’m looking for the best all around performing tire regarding load, hwy speeds, wear, etc. Do you suggest other options? Thank you!

asked by: Roger

Helpful Expert Reply:

The Kenda Karrier S-Trail ST145/R12 Radial Trailer Tire - Load Range E # AM10140 and the Aluminum Lynx Trailer Wheel - 12" x 4" Rim - 5 on 4-1/2 - Silver # LH45FR is the wheel and tire that you want. There is very little difference between the two except for Load Range. I would choose the higher load range. These do not come mounted, so you can have them mounted at a local shop when they arrive.

expert reply by: Jameson C

Paul

4/30/2024

What is the difference between a ST145/70R12 Radial and a standard ST145/R12?

Jameson C.

5/1/2024

@Paul Those two sizes mentioned have a different aspect ratio. The ST145/12 is the same as the ST145/80-12 which I suspect is what you actually meant to type.

Paul

5/1/2024

@JamesonC no its the 70 I'm talking about. As I now understand it after research the 145R12 is just over an inch in diameter bigger then the ST145/70R12. Is that right