WIDTH – width of the tyre in millimetres. In our example, the tyre is 185mm wide
PROFILE – indicates the aspect ratio of the tyre, in other words the height of the sidewall expressed as a percentage of the tread width. In our example, the sidewall height is 60% of the tread width. The lower the figure, the lower the sidewall height
RIM SIZE – this is the inside diameter of the tyre, in other words the rim height. This diameter is given in inches. In our example, the diameter is 14 inches.
LOAD INDEX – a number relating to the load- carrying capacity of a tyre. The higher the tire’s load index number, the greater its load carrying capacity.
SPEED RATING – indicates the maximum speed for the tyre when at full load.