E.T.R.T.O.

Sheldon Brown's Bicycle Glossary · letter E-F
← Erickson Gizzmo ® · Euro Bottom Bracket →

European Tire and Rim Technical Organization. This is the modern system for designating tire and rim sizes, but it has been adopted by the ISO, so the designation "E.T.R.T.O." is obsolescent.

This system is explained in detail in my article on Tire Sizing

Copyright © 1996, 2008 Sheldon Brown

Original: https://www.sheldonbrown.com/gloss_e-f.html#etrto · Reproduced on en.wikipedalia.com with permission, all rights reserved.