Tyre Size Decoder

Tyre Size Decoder


Tyre size converter

The table below allows conversion between pre-1960 tyre sizes, post-1960 crossply tyre sizes and radial tyre sizes,
and modern metric radial tyre sizes.


Tyre size decoder

The different ways that tyre sizes can be expressed are shown below.

If you're measuring your rims, please note the measurement is taken
where the tyre is actually seated rather than the wider the rim edge.

Use this information to check the tyre size you need. 



 Tyre load index decoder

 The load index relates to the weight that can be carried by each individual tyre.


 Tyre speed ratings

 The speed rating of a tyre relates to the maximum speed under load.