Can ST205/75/D15 Size Trailer Tires be Replaced with ST225/75/R15 Size

Updated 10/25/2024 | Published 03/17/2016

Products Featured in This Question

Provider ST225/75R15 Radial Trailer Tire - Load Range D

(1094)

$155.80

Karrier ST225/75R15 Radial Trailer Tire - Load Range E

(2230)

$173.14

Question:

I need four new trailer tires for a utility trailer. I currently have white rims. The current tire size is ST 205/75/D15. Can they be replaced with ST225/75/R15?

asked by: Jim M

Expert Reply:

You can change your ST205/75/D15 trailer tires to a larger ST225/75/R15 size IF your 15-inch rims are either 6-inches or 6-1/2-inches wide AND IF you have sufficient clearance around the tires for the increased width and overall diameter of the ST225/75/R15.

A 205/75-15 tire when mounted and inflated has an overall diameter of about 27-inches. A tire in size ST225/75/R15 has an overall diameter of 28.4-inches, about an inch-and-a-half larger. The larger tire will also be about 3/4-inch wider.

I have linked an article with tire sizing information as well as our main page for special trailer tires in size 225/75-15. These include both bias ply and radial types and choices of Load Range, either C, D or E. For the highest capacity tire you can use the Kenda # AM10303 which is a LR E radial rated for 2830-lbs at 80-psi.

Always inflate trailer tires to the full cold psi pressure noted on the tire sidewall.

expert reply by: Adam R

Scott R.

10/25/2024

I have a trailer that currently has ST 205/75 D15 tires on it, can I replace them with ST 205/75 R15 tires without replacing the rims?

Kate F.

10/25/2024

@ScottR Yes, you can swap out your Bias trailer tires ST 205/75 D15 with a Radial tire ST 205/75 R15 and it will still fit the same rim. For a load range C which which gives you a Maximum load of 1,820 lbs at 50 psi I would go with Karrier ST205/75R15 Radial Trailer Tire - Load Range C # KE33KV. If you need a higher weight rating then I would go with the load range D which will give you a Maximum load of 2,150 lbs at 65 psi Karrier ST205/75R15 Radial Trailer Tire - Load Range D # AM10245.