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Tyres form a vital part of your vehicle.
They're more than just a black mass of rolling rubber. Tyres are
the only link that the rest of a car has with the road and vice
versa. While the car puts down the power that is produced by the
engine through the tyres, the tyres in turn offer grip and feedback
through the suspension and steering to tell the driver exactly what's
going on. A good car is lost in purpose without the right set of
tyres. Figuring out which tyres to use isn't exactly rocket science
thanks to laws that make it mandatory for tyre manufacturers to
mould certain parameters of the tyre on the sidewalls.
Refer to the picture of the tyre sidewall.
Here’s what the codes stand for:
205/50:
Stands for 205mm. This is the size of the nominal section width
of your tyre in millimetres.
50:
Stands for 50%. This figure is known as the aspect ratio and is
the height of the tyre’s sidewall as a percentage of the nominal
section width
R15:
The R is for radial construction and 15 is the diameter of the tyre’s
inner rim in inches.
86V:
86 is the load capacity and V represents the speed capacity.
Following is a detailed chart on load and
speed indexes.
Speed Rating:
| Tyre Speed Symbol |
Tyre Speed Rating
|
km/h |
Mph |
| S |
180 |
112 |
| T |
190 |
118 |
| U |
200 |
125 |
| H |
210 |
130 |
| V |
240 |
149 |
| W (ZR) |
270 |
149 |
| Y (ZR) |
300 |
186 |
| ZR |
Above 240 |
Above 149 |
The table below gives the load index and the speed symbol
with their corresponding values:
Load
Index
|
Load in Kg per tyre |
Load Index |
Load in Kg per tyre |
Load Index |
Load in Kg per tyre |
Load Index |
Load in Kg per tyre |
Load Index |
Load in Kg per tyre |
| 62 |
265 |
75 |
387 |
88 |
560 |
101 |
825 |
114 |
1180 |
| 63 |
272 |
76 |
400 |
89 |
580 |
102 |
850 |
115 |
1215 |
| 64 |
280 |
77 |
412 |
90 |
600 |
103 |
875 |
116 |
1250 |
| 65 |
290 |
78 |
425 |
91 |
615 |
104 |
900 |
117 |
1285 |
| 66 |
300 |
79 |
437 |
92 |
630 |
105 |
925 |
118 |
1320 |
| 67 |
307 |
80 |
450 |
93 |
650 |
106 |
950 |
119 |
1360 |
| 68 |
315 |
81 |
462 |
94 |
670 |
107 |
975 |
120 |
1400 |
| 69 |
325 |
82 |
475 |
95 |
690 |
108 |
1000 |
121 |
1450 |
| 70 |
335 |
83 |
487 |
96 |
710 |
109 |
1030 |
122 |
1500 |
| 71 |
345 |
84 |
500 |
97 |
730 |
110 |
1060 |
123 |
1550 |
| 72 |
355 |
85 |
515 |
98 |
750 |
111 |
1090 |
124 |
1600 |
| 73 |
365 |
86 |
530 |
99 |
775 |
112 |
1120 |
125 |
1650 |
| 74 |
375 |
87 |
545 |
100 |
800 |
113 |
1150 |
126 |
1700 |
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