Meaning of Numbers and Letters in Trailer Tire Size Designation 205/75-14

Updated 04/19/2018 | Published 04/18/2018

Question:

What does a 100/96 M mean. I have 205-75-14R. Advanta tires made in China on my trailer.

asked by: Martin E

Helpful Expert Reply:

In the world of metric tire sizing the three numbers in a tire size 205/75R14 refer to three different tire dimensions. All tire and wheel/tire products in your size are shown on the linked page, such as # TTWA14RWS and # AM10235.

The first number, 205, refers to the width of the tire in millimeters. The second number, 75, refers to the tire's sidewall aspect ratio (also called section height) and means in your case that the aspect ratio of your tire is 75% of the tire's width. The R letter indicates the tire has radial construction. And finally the 14 indicates the diameter of wheel the tire will fit.

I linked three helpful article on trailer tires that will give you plenty of good information to guide your selection and safe use of your tires.

A trailer tire's speed rating is usually denoted by a letter code. For examples, an L-rated tire can handle speeds up to 75-mph while an M-rated tire can handle higher speeds up to 81-mph.

expert reply by: Adam R