Tire sizing standards organizations
6 posts
ETRTO vs TRA Tire Standards: Understanding the Differences
A guide to ETRTO and TRA tire standards, explaining how to read tire size markings, compare dimensions, and interpret load and inflation tables for correct fitment.
Tire and Rim Association Standards: Understanding Tire Sidewall Markings
Learn how to interpret tire sidewall numbers and markings according to Tire and Rim Association (TRA) standards. Understand width, aspect ratio, rim diameter, and how to compare tire sizes.
ETRTO Tire Standards: What They Cover and How to Use Them
What ETRTO tire standards cover, how to read sidewall markings such as 205/55 R16 91V, and how to calculate and compare sidewall height, diameter and circumference.
JATMA Tire Standards: Reading Sidewall Numbers, Rim Dimensions and Load-Inflation Tables
How to read tire sidewall numbers under JATMA tire standards: size designations, aspect ratio, rim diameter, load index, speed symbol, rim dimensions and load-inflation tables, with diameter and circumference calculations.
ISO Tire Size Standards: Understanding Size Designations and Charts
How to read ISO tire sizes on the sidewall, including width, aspect ratio, rim diameter, load index and speed symbol, and how to compare sizes using an ISO tire size chart.
Tyre and Rim Association of Australia Standards Manual: How to Read the Numbers on a Tyre Sidewall
How the TRAA Standards Manual relates to tyre sidewall numbers, rim dimensions, load and speed ratings, and simple size calculations, with the limits of calculated geometry and fitment.