What Does the D Mean in the ST205/75D15 Tire Size?

Published 02/26/2023

Products Featured in This Question

Loadstar ST205/75D15 Bias Trailer Tire - Load Range C

(3847)

$79.91

Karrier ST205/75R15 KR03 Radial Trailer Tire - Load Range D

(2300)

$125.89

Question:

Why are these Loadstar ST205/75D15 Bias Trailer Tire - Load Range C listed as load range C when the tire model number and picture clearly states 75D15

asked by: STEPHEN D

Expert Reply:

The D in ST205/75D15 is for the internal construction of the tire. The D stands for diagonal or bias ply construction. That means the tire body plies inside the tire will crisscross. If the load rating is included in the tire description it would be at the end and look like this ST205/75D15 C.

The Loadstar ST205/75D15 Bias Trailer Tire item # AM1ST92 is a load range C tire with a maximum capacity of 1,820 lbs at 50 psi each. This tire has a speed rating of M that tops out at 81 mph.

If you are looking for a load range D ST205/75R15 tire you will want the Karrier Radial Trailer Tire item # AM10245.

expert reply by: Jerred H