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Support & Service / Tire Guide / Tire Size Specs
​Tire Size Specs

225 / 40 Z R 18 92 W Nominal Section Width in Millimeters Nominal Aspect Ratio as a Percentage Initial Z means speed capacity ≥
240Kph
Radial Construction Nominal Rim Diameter in
Inches
Load Index Speed Symbol overall width section height (H) rim
diameter
overall
diameter

Aspect ratio(%) = Seciton Height Seciton Width X 100