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On a tire what does Zr mean?

Updated: 10/23/2022
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14y ago

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Prior to 1991, tire speed ratings were shown inside the tire size, before the "R" character. The available codes were SR (112 mph, 180 km/h), HR (130 mph, 210 km/h), VR (in excess of 130 mph, 210 km/h) and ZR (in excess of 149 mph, 240 km/h). The ZR code is still in common use, often combined with a W or Y speed code.

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Q: On a tire what does Zr mean?
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Is a zr tire the same as a z?

A ''Z'' tire means that the top speed rating of the tire is not designated, and you must consult the manufacturer to obtain the rating. A ''W (ZR)'' tire's top speed rating is 270 km/h or 168MPH. A ''Y (ZR)'' tire's top speed rating is 300 km/h or 186 MPH. A ''ZR'' tire is rated at top speed of 300 km/h or 186 MPH, AND ABOVE. No, ''Z'' tires, and ''ZR'' tires are not the same.


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