How to read your tyre size?
P - Passenger car tyre. If there is no P before the size it would indicate it is a European metric tyre. An LT before the size would designate a light truck tire.
205 - This is the Section Width in millimeters. This measurement is taken from sidewall to sidewall.
65 - This number refers to the height of the sidewall, or the Aspect Ratio. It is a percentage of the section width. In this example, you would take 65 percent of 205 millimeters and this would give you the sidewall height.
R - Radial tyre construction.
15 - Wheel diameter in inches.
H - The speed rating for your tyre