KNOW YOUR TYRE

METRIC SIZED TYRE

READING THE SIZE INDICATION

* This size indications are classified into 2 types. The imperial size which is very common and the metric size which is standardized based on the I.S.O. standared.

Example of Imperial Size Marking

Example of Metric Size Marking

TYRE CONSTRUCTION

TREAD (RUBBER)

This is the external rubber covering a tyre.


FUNCTION:

  • It protects the carcass against injuries from external sources.
  • It is the recepient of the wear and tear of the tyre through abrasion.

CARCASS

The layer or layers of tyre cord topped or coated with rubber forming the main structure of the tyre.


FUNCTION:

  • To support the load.
  • To form and maintain the shape and rigidity of the tyre simillar to that of the skeleton for the human body.

BEADWIRE

A hard drawn steel wire sheathed with rubber and creeled to the required circumference.


FUNCTION:

  • To ensure a firm and rigid seating of the tyre on the rim.

Load Capacity Index

Speed Symbol