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Tyre Measurement Guide

The lettering on your tyre sidewall tells you the exact specifications of your tyre. It's easy to understand if you follow this simple example:

measurement
Sidewall Marking Explanation
205 Width of the tyre in millimetres
50 Height of the tyre sidewall as a percentage of the width. In this case 50% of 205mm. Also known as the aspect ratio.
R Radial Construction.
15 The diameter of the tyre's inner rim in inches
91 Load Capacity of Tyre (See Load Tables below). In this case its 615kg
V Speed Symbol. Indicates the max. speed for the tyre at full load. In this case 149.1mph. (See Speed Ratings tables below).
E4 ECE type approval mark, which demonstrates the tyre has been tested as high quality by the European Regulatory Authorities.

What is a Speed Rating?

This is indicated by the speed symbol on the tyre sidewall, and represents the maximum speed that this tyre can sustain at full load. Consult your vehicle manufacturer to check which speed rating your vehicle requires. It is of the utmost importance that you stick to the manufacturer's guidelines. Insurance can be void if you select the incorrect tyre.

Speed Symbol KPH MPH
Car
S 180 112
T 190 118
U 200 124
H 210 131
V 240 149
W 270 168
Y 300 186
VR 210+ 130+
ZR 240+ 150+
Winter / Reinforced
Q 160 100
R 150 106
Van
N 140 87
P 150 106
Truck
J 100 62
K 110 68
L 120 75
M 130 81

What is a tyre load rating?

The Load capacity of a tyre determines what payload each tyre can carry. It is vital that you check with your manufacturer what capacity should be put on your car. In certain cases insurance can be void if you select the incorrect tyres. The following table shows what Index specification can carry.

Load Index Load in KG
62  265 
63  272 
64  280 
65  290 
66  300 
67  307 
68  315 
69  325 
70  335 
71  345 
72  355 
73  365 
74  375 
75  387 
76  400 
77  412 
78  425 
79  437 
80  450 
81  462 
82  475 
83 487
84  500 
85  515 
86  530 
87  545 
88  560 
89  580 
90  600 
91  615 
92  630 
93  650 
94  670 
95  690 
96  710 
97  730 
98  750 
99  775 
100  800 
101  825 
102  850 
103  875 
104  900 
105 925
106  950 
107  975 
108  1000 
109  1030 
110  1060 
111  1090 
112  1120 
113  1150 
114  1180 
115  1215 
116  1250 
117  1285 
118  1320 
119  1360 
120  1400 
121  1450 
122  1500 
123  1550 
124  1600 
125  1650 
126 1700

How do I know if my tyres are Trading Standards approved?

Check your tyre for an "E" Number. e.g. E4 0213760. This is an ECE type approval mark and number that shows if the tyre has been tested and passed as high quality by the European regulatory authorities. All tyres sold by On Site Tyre Service carry this mark and are therefore of the highest quality.

Need New Tyres?

Call into our depot on the Coes Road, Dundalk, Co. Louth or contact us by telephone on 042 935 1678.