Everything you need to know about machinery tyres 

In addition to the size in millimetres, the size can also be indicated in inches, an example of this is 14.00R25. The 14.00 is the width of the tyre in inches, the height is not shown in the size, for each size in inches there is a radial size available. For the size 14.00R25 in inches equals the radial size 385/95R25, from this size the height can be extracted.

The size indication in millimetres is given by a width size, height size and diameter. An example is the size 750/65R25, which means that the tyre has a width of 750 millimetres, 65 is the percentage of the width that equals the height of the tyre. The 25 is the diameter of the rim, so the size is as follows: 750 millimetres wide, with a height of 65% and a rim diameter of 25 Inch.

The load capacity of the earthmoving tyres is indicated by means of a Load Index (LI) for radial tyres and by means of a Ply Rating (PR) for diagonal tyres. The load index or ply-rating is combined with a speed index, which is therefore often called the load/speed index.