What is tyre size?
The tyre size is a unique alphanumeric code, imprinted on the sidewalls of tyres.
Decoding tyre size
A tyre size provides the following information:
- Tyre width
- Aspect ratio or profile
- Type of construction
- Rim diameter
- Load index
- Speed rating
To get a better understanding, let’s go through this example: 205/60R15 91V
205: The first three digits denote the width of the tyre. It is measured in millimetres.
60: It is the aspect ratio or profile of the tyre in question. The aspect ratio is obtained by dividing the height of the tyre sidewall by the width and then multiplying it by 100.
R: This alphabet signifies the type of construction the tyre comes with. ‘R’ refers to radial construction. Most tyres in the UK today are of radial construction.
15: It is the rim diameter which is represented in inches.
91: This denotes the maximum load-carrying capacity of the tyres.
V: The speed rating of a tyre indicates the maximum speed at which that tyre can run with its optimum load capacity.
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