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