The tyre size might read like this: **P195/55 R16 87 V**. Hardly user friendly but, when you know what it all means, you’ll realise it tells you useful information about the tyre’s construction, size and type.

The first three numbers, in this case 195, refer to the section width of the tyre. This is the measurement, in millimetres, from the tyre’s inner sidewall to its outer sidewall.

The aspect ratio, or profile, refers to the height of the sidewall as a % of the section width. In our example, 55 means the height is equal to 55% of the 195mm width. The bigger the aspect ratio, the bigger the sidewall will be.

The letter R means the tyre is a radial construction. Almost all new car tyres are radials.

The number to the right of the construction type is the rim diameter, measured in inches. In this case, it’s a 16” wheel.

The final number is the load index i.e. the maximum load (in kg) that the tyre can carry. See chart below

Load Index | Load in kg | Load Index | Load in kg | Load Index | Load in kg | Load Index | Load in kg |

62 | 265 | 79 | 437 | 96 | 710 | 113 | 1150 |

63 | 272 | 80 | 450 | 97 | 730 | 114 | 1180 |

64 | 280 | 81 | 462 | 98 | 750 | 115 | 1215 |

65 | 290 | 82 | 475 | 99 | 775 | 116 | 1250 |

66 | 300 | 83 | 487 | 100 | 800 | 117 | 1285 |

67 | 307 | 84 | 500 | 101 | 825 | 118 | 1320 |

68 | 315 | 85 | 515 | 102 | 850 | 119 | 1360 |

69 | 325 | 86 | 530 | 103 | 875 | 120 | 1400 |

70 | 335 | 87 | 545 | 104 | 900 | 121 | 1450 |

71 | 345 | 88 | 560 | 105 | 925 | 122 | 1500 |

72 | 355 | 89 | 580 | 106 | 950 | 123 | 1550 |

73 | 365 | 90 | 600 | 107 | 975 | 124 | 1600 |

74 | 375 | 91 | 615 | 108 | 1000 | 125 | 1650 |

75 | 387 | 92 | 630 | 109 | 1030 | 126 | 1700 |

76 | 400 | 93 | 650 | 110 | 1060 | ||

77 | 412 | 94 | 670 | 111 | 1090 | ||

78 | 425 | 95 | 690 | 112 | 1120 |

Tyre load rating table

The final character (in this case V) relates to the maximum speed of use. Again, the following table will clarify what your tyre’s symbol means.

Speed Rating | Mile/Hour | Kilometers/Hour | Speed Rating | Mile/Hour | Kilometers/Hour | |

N | 87 | 140 | U | 124 | 200 | |

P | 93 | 150 | H | 130 | 210 | |

Q | 99 | 160 | V | 149 | 240 | |

R | 106 | 170 | ZR | 150+ | 240+ | |

S | 112 | 180 | W | 168 | 270 | |

T | 118 | 190 | Y | 186 | 300 |

Tyre speed rating table

You’ll find you car’s tyre size on the tyres’ sidewall, in your car’s vehicle manual as well as on a sticker inside the driver’s door. If you’re still unsure, visit your nearest Uniroyal dealership for advice.

Uniroyal. A brand of Continental.