Is It Okay to Use Different Tire Sizes on Trailer

Question:

I have a G78-14ST, ST215-75D14 Deli Tire on one side and a ST205/75D14 Hi Run on other side. Both are load range C. Are these the same? if not can I get a matching tire to one and use the other as spare. These are on a Master Tow dolly.

asked by: Joseph R

Helpful Expert Reply:

The two tire sizes you have are similar but they are not the same. The 215 tire size is slightly larger in diameter and in width. You would want to go with a new wheel and tire in the size of ST205/75R14 like the part # AM32153 to match that size. The diameter difference between the two is right at 1/2 of an inch. Using different size tires is not safe so we recommend always running same size all around.

expert reply by: Jameson C