![]() The is not responsible for any errors that may arise with its usage. Please note that the chart data should be verified with the tire/wheel manufacturer. ** Tire manufacturer must include a "Z" in the size designation. * Tire manufacturer may or may not (is not obligated to) include a "Z" in the size designation. Tires having a maximum speed capability above 300 km/h (186 mph) must have "Z" in the tire size designation and the service description must include Y in parenthesis (i.e., P275/40 ZR17 93(Y)). P275/40 ZR17 93 W or 275/40 ZR17 93 Y) is the tire which have a maximum speed capability above 240 kmph/149 mph. "Z" RatingsĪ tire rated with the letter "Z" in the tire size designation (i.e. For e.g., the letter "T" defines the maximum speed limit at 190 kmph/118 mph (Please see the tire speed rating chart below). Speed rating on tires is expressed by a letter from A to Z (the speed symbol), ranging from 5 km/h (3 mph) to above 300 km/h (186 mph). It describes the top speed for which a tire is certified. The speed rating system as it is used today was developed in Europe as a response to the need for classifying tires into standardized speeds. The speed rating is identified as a part of the tire size designation or the tire's service description, together with the tire load index. Tire speed rating or tire speed index/symbol specifies the top speed the tire can sustain when properly inflated, under service conditions specified by the tire manufacturer. Tire Pressure Conversion Charts - bar to psi and psi to bar.Rim width range and Measuring rim width for Tire Size.Tire Size Conversion Chart - Inches to Metric - by OD.Tire Size Conversion Chart - Inches to Metric - by RD.Tire Size Conversion Chart - Metric to Inches - by OD.Tire Size Conversion Chart - Metric to Inches - by RD. ![]() Light Truck and a tire used on light trucks.Set Higher Winter Tire Pressure In Your Garage.Why Minus Size Winter Tires and Wheels?.Tire Size Converter - Tire Size Conversion.Tyre Size for Rim Size/Width Calculator.Tire Size Calculator - Compare Tire Dimensions.
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