①Width:
The section width of your tyre in millimetres, from the inner sidewall to the outer sidewall.
②Aspect Ratio:
The height of your tyre from the base of the tread to the rim, as a percentage of the tread width. Low profile tyres have smaller aspect ratios.
③Tyre Construction:
The method used to construct your tyre. Example: R, for radial ply construction. This is the most common method of construction for passenger tyres.
④Rim:
The diameter of the wheel rim in inches. If you are buying wheels for existing tyres, this is the size you will need.
⑤Load Index and Speed Symbol
The maximum load capacity under which your tyre can safely operate, and at what speed. This is subject to the tyre being in sound condition, correctly fitted, and with the recommended inflation pressure. Example: 91 V
