Tyre sizes explained and made easy with these tips from Bridgestone.
205 indicates the section width of a tyre in millimetres.
60 is a tyre’s aspect ratio or profile which is its height from the base of the tread to the rim. This number represents a percentage of the tread width. For example, the height of this tyre is 60% of its width. Low profile tyres have smaller aspect ratio percentages.
R means that the tyre has radial ply construction, meaning the way in which it has been constructed. Most car tyres are constructed this way so you will rarely find a car tyre without an R.
15 indicates the diameter of the wheel rim in inches. So if you are buying wheels for existing tyres, this is the size you will require.
91 is a code which indicates the maximum load capacity of the tyre. See load index table for car tyre load index ratings.
V is a code which indicates the speed at which a tyre can be safely operated, subject to the tyre being in sound condition, correctly fitted and with the recommended inflation pressure. See speed symbol table for car tyre speed symbol ratings.