What does 195/65 R15 mean on a tire?
P195/65R15 The first number tells the tread width, in millimeters. It usually ranges from 155 to 245. The second number indicates the height of the sidewall; it is a percentage of the tread width. Mostly between 80 and 45. The letter R means that the tire is a radial. This is the maximum width of the tyre, under conditions in which the vehicle is fully loaded, and in our example as you may have guessed, this comes to a maximum of 195 mm. Represents the ratio between the width and height of the tyre from the rim.Let’s take a common tyre size as an example: 195 65 R15 91 V: 195 – this is the width of the tyre in millimetres. This is also known as the aspect ratio.This is also known as the aspect ratio. The lower the number, the more ‘low-profile’ the tyre.
What does d or r mean on tires?
After the aspect ratio, there will generally be a letter – either R, D, or B. This refers to the internal construction of the tire. R stands for radial, the industry standard for most passenger vehicles today. D means diagonal construction, while B signifies belted bias construction. A 65 aspect ratio tire has a taller sidewall than a 60, which may affect handling and speedometer accuracy.Similarly, we only recommend changing the aspect ratio by 5% either side of your cars preferred size. For example, a car designed to take a 60 aspect ratio tire could also fit a 55 or 65 aspect ratio. In winter it is very common to ‘downsize’ tires – this is making the width slightly smaller.The aspect ratio is indicated on the tire sidewall as a percentage. It’s the height of the sidewall measured from wheel rim to top of the tread, expressed as a percentage of tire width. In this example, the aspect ratio is 65, meaning the sidewall is 65 percent as high as the tire is wide.These numbers show the aspect ratio, which is the tire sidewall height in percentage to width of the tire. The width of Sidewall is directly proportional to the aspect ratio, a 70 aspect ratio means the sidewall height is 70% of 265mm while 65 aspect ratio means it is 65% of 265mm.