Corvette Glossary Of Terms
Z
Z-Rated Tire
Once known as the highest speed rating of any commercially produced tire, the “Z-Rated” Tire is still used today to designate tires for high-performance vehicles.
The speed rating denotes the maximum speed at which a tire is designed to be operated. When the “Z” speed rated tire was introduced, it was universally recognized as qualifying its usage for speeds that were”unlimited”. 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).
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