Difference Between Trailer Tire Size 205/75R15 and 205/75D15

Published 04/22/2015

Question:

205/75r15. Came off. Put. On. 205/75d15. Is this ok. For my trailer

asked by: Blaine

Expert Reply:

Based on the tire sizes you listed you went from a radial tire to a bias ply tire of the same size. As long as all of the tires on your trailer are of the same construction you would be just fine.

The main difference between a radial ply and a bias ply tire is how the tire is constructed. The cords inside a bias ply tire run at a 32 degree angle to the direction of travel, and the cords on a radial tire run at a 90 degree angle to the direction of travel, or across the tire from wheel lip to wheel lip.

A radial tire flexes more than a bias tire, giving it better ground contact, traction, stability, and tread wear.

A radial tire will normally run cooler than a bias ply tire, especially when the tire is under a load. A tire that runs cooler will last longer.

expert reply by: Jameson C