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How to read my car tyre size?

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  • Tyre Width

    145 indicates the section width of a tyre in millimetres.

  • Aspect Ratio Or Profile

    80 indicates Aspect Ratio of tyre. This number indicates sidewall height of the tyre as a percentage of tyre width. Here, sidewall height of the tyre is 80% of the width.

  • Tyre Construction

    R indicates that the tyre has radial ply construction. Almost all car tyres come with radial ply construction.

  • Rim

    12 indicates the Diameter of the wheel rim in inches.

  • Load Index

    74 indicates Maximum Load Capacity of the tyre. Please refer to the Load Index table.

  • Speed Symbol

    T is the Speed Symbol and it indicates at the maximum speed for the tyre at full load. Please refer to the Speed Symbol table.

Tyre Load Index Ratings

Index 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77
kg 265 272 280 290 300 307 315 325 335 345 355 365 387 400 412 425

 

 

 

Index 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93
kg 437 450 462 475 487 500 515 530 545 560 580 600 615 630 650 670

 

 

 

Index 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108
kg 690 730 750 775 800 825 850 875 900 925 950 975 1000 1030 1060

 

 

 

Index 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123
kg 1090 1120 1150 1180 1215 1250 1285 1360 1400 1450 1500 1550 1600 1650 1700

Tyre Speed Symbol Ratings

Speed symbol N P Q R S T U H V Z W Y
miles/h 87 93 99 106 112 118 124 130 149 150+ 168 186
km/h 140 150 160 170 180 190 200 210 240 240+ 270 300

 

 

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