June 20, 2019 / Bicycle News

Americana Kenda Rubber, through it’s staff at the Kenda American Technological Center continue to be a leading force behind the ISO Working Group 16 (WG16) and the revision of parts one and two of the ISO 5775 standards.  As the leading voice of the American tire manufacturing members in WG16, Kenda Tire’s involvement continues to address issues regarding tire and rim fit discrepancies, a process which began 2015 with internal revisions on it’s own line of products.


We felt it was critical to see these changes implemented” said Kenda Bicycle Development Engineer and working group representative Joe Angeli.  “Both ISO and ETRTOhave been using standards that have not evolved with the times.”  Angeli further adds that, “even though ETRTO is revised annually (opposed to the five year cycle for ISO), the design rims still do not match what is being used in the market today.  For example, sizes that are now commonplace in the market like 29x2.40 (61-622) or 29x2.60 (66-622) are not addressed by the 2019 ETRTO standards.”  The members of the WG16 represent manufacturers globally at the ISO level, with contributions from the North America members submitted through ANSI, Europe/ETRTO, and Japan/JIS.  The final revisions will not be presented as a co-branded standard; instead, there is an understanding by the members of the working group that ISO will reflect the designations and methods outlined within the revisions of 5775.  This way there will not be competing standards within the industry.

The revisions recommended by the WG16 to ANSI, the U.S. member of ISO, seek to develop a set of standards that address the widening of rims and continued growth of tubeless and tubeless-ready tires.  Split into 2 sections, 5775-1 (Tire Designations and Dimensions) and 5775-2 (Rims).

Part 1 standardizes a wide range of specifications, including what tires should be designated in terms of sizing (width and diameter) and methodology for measuring sizing.  Also included are criteria for a tire/rim line to indicate complete engagement between the two.  “This is more than a simple sizing revision,” said Jay Drunasky, Project Engineer.  “Joe (Angeli) and I rewrote the entire 5775-1 standard from top-to-bottom to ensure that inconsistencies found in today’s sizing standards would be eliminated.  The updated standards will cover tires ranging in width as small as 18mm, all the way up to 132mm (5.20”), many of which are currently not covered by existing standards.”

Part 2 standardizes allowable dimensions for the various types of rims (Hooked type and Straight-Side).

Upon completion, the efforts of Kenda Tire and the other members of WG16 will result in an industry wide unification of tire sizing and rim/tire fitment.  Bike shops and riders will no longer have to worry whether or not a tire from one manufacturer will be the same size as another manufacturer; or if a tubeless tire will work on one rim versus another. 

The next steps for the working group includes the creation of a finalized draft for submission to ANSI and the ASTM before global review by ISO.  During this process, Kenda Tire will continue to be the voice of the tire manufacturers within the WG16 as well as serving as a resource for retailers and customers interested in learning more about the changes within ISO 5775-1 & 5775-2. 


ISO - (International Organization for Standardization) is a worldwide federation of national standards bodies.

ASTM - International, formerly known as American Society for Testing and Materials, is an international standards organization that develops and publishes voluntary consensus technical standards for a wide range of materials, products, systems, and services.

ANSI - (American National Standards Institute) is the primary organization for fostering the development of technology standards in the United States. ANSI works with industry groups and is the U.S. member of the International Organization for Standardization (ISO).

ETRTO – (European Tire and Rim Technical Organization) is the organizing body tasked to specify and match the appropriate size of rims and pneumatic tires for European Union countries.  ETRTO is responsible for all vehicle types, including bicycles.

JIS – (Japanese Industrial Standards) are the standards used for industrial activities in Japan, coordinated by the Japanese Industrial Standards Committee and published by the Japanese Standards Association. 

If you would like more information about this topic, please contact Ben Anderson at


Founded in 1962, Kenda has operated under the core values of Honesty, Innovation, Quality, and Customer Service. Over the years, Kenda has continued to develop and expand its product offering to meet changing market demands. Today, Kenda is one of the world’s leading tire and tube manufacturers for automotive, bicycle, motorcycle, ATV, wheelchair, golf cart, lawn care equipment, trailer, skid loader, and agricultural vehicles. With factories all over the world, Kenda is able to provide quality products to suit a wide variety of applications.