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.