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Technical data and identification
Tyre indication
Important tyre information can be found on the side of the tyre.
1. Tyre type and size
2. Load index
3. Speed index
Tyre type and size
An example of a tyre type and size is 285/70 R19.5.
This tyre has a width of 285 mm. The height is given as a ratio to the width. 70 means
the height is 70% of the width.
The R means the tyre is of a radial construction.
19.5 is the diameter in inches of the wheel that the tyre is designed to fit.
NOTE: The size on some tyres is displayed in inches. An example is 11
R22.5.
Load index
An example of a load index code is 144/142.
The load index is a standardised numerical code that indicates the maximum permitted
load of a tyre. On truck tyres, there are often two load index numbers, for example 144/
142. The first number (144) indicates the load index if the tyre is used in single
formation. The second number (142) indicates the load index if the tyre is used in twin
formation.
NOTE: A tyre must be replaced by one with at least the same load index.
Speed index
An example of a speed index code is M.
The speed index is a standardised numerical code that indicates the maximum
permitted speed of a tyre.
The most common tyre speed rating codes with the associated maximum speed for
trucks are:
– K - 110 km/h
D002127
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