You are here:

Tires/TIRES

Advertisement


Question
WHAT IS THE DIFFERANCE IN A CONTIENTAL 22540ZR18 92YXL AND A CONTIENTAL 22540R18 92YXL

Answer
Charlee,

It used to be that speed ratings were imbedded in the tire size so people would pay attention to them.  But times have changed and the current practice is to place the speed rating with the load index after the tire size.

That means there is no difference between the 2 tires as you have written them

 - BUT -

There may be differences if the names of the tires are different

- AND -

it is possible that there are 2 tires listed with the same name and the same size, but because they are supplied to different vehicle manufacturers, they could be different.  Perhaps the difference in the way the sizing/speed rating is stated is a clue to this.

If you want more detail, I will need to know what the tire name is, not just the manufacturer.

Tires

All Answers


Answers by Expert:


Ask Experts

Volunteer


Barry Smith

Expertise

I have over 30 years experience in the design, manufacturing, and testing of tires. I have served as the technical advisor to the "800" number. I have authored or co-authored many publications - usually without credit. I can answer almost any technical question, but please don`t ask me to compare brands. I probably have prejudices because of my work experience.

Experience

Member SAE (Society of Automotive Engineers) Member Tire Society (Tire Technical Organization) SCCA Regional Competiton License holder Authored many training manuals on tires, their care and use.

Organizations
SAE (Society of Automotive Engineers) SCCA (Sports Car Club of America) Tire Society

Publications
You may want to visit my web site: http://www.barrystiretech.com/index.html

Education/Credentials
I am a graduate of the University of Dayton, Dayton, OH - BME, 1971 I attended graduate school at the University of Akron - but did not complete my PhD - something I regret.

©2016 About.com. All rights reserved.