Tyres Definitions

 

Rim Width

The linear distance between the flanges of the rim.

Section Height

Half difference between the overall diameter and the nominal rim diameter.

Nominal Section Width

The section width of an inflated tyre mounted on its theoretical rim and indicated in the tyre size designation.

Section Width

The linear distance between the outsides of the sidewalls of an inflated tyre excluding elevations due to labelling (markings), decorations, or protective bands or ribs.

Nominal Rim Diameter

A size code figure for reference purposes only, as indicated in the tyre and rim size designation.

Overall Diameter

The diameter of an inflated tyre at the outermost surface of the tread.

Overall Width

The linear distance between the outsides of the sidewalls of an inflated tyre including elevations due to labelling (markings), decorations, or protective bands or ribs.