ZR Tire Code Explained: What Does It Mean?
Here’s a breakdown of the information about ZR-rated tires from the provided text:
What ZR/Z Ratings Mean:
Speed: Tires with a Z or ZR rating can handle speeds over 149 mph.
Sub-ratings: Within the Z/ZR category, there are more specific ratings:
W: Up to 168 mph
Y: Up to 186 mph
(Y): Over 186 mph (Z is always included with this rating, adn the load index is in brackets)
How to Find the Speed Rating on a Tire:
- Locate the Numbers: Find the four or five numbers after the letter “R” on the tire sidewall.
- Rim Diameter & Load Index: the first two digits are the rim diameter, and the last two or three are the tire load index.
- Speed Rating Letter: The letter immediatly following the load index is the speed rating.
ZR Specifics:
Not a Dedicated Rating: Z/ZR isn’t a standalone rating; its how higher speed ratings are indicated.
Z Appearance:
If the rating is W or Y, a “Z” may or may not appear before the “R”. (Michelin & General Tire include it,Bridgestone doesn’t).
If the rating is (Y), the “Z” always appears, and the load index is in brackets. Exmaple: A tire with a rim diameter of 17, load index of 95, and (Y) speed rating would be labeled as “ZR17 (95Y)”.
When to buy ZR-rated tires: The article includes an image of a Continental tire on a sports car, suggesting these tires are appropriate for high-performance vehicles. However, the text doesn’t explicitly state when to buy them, onyl what the rating means.