Dimension is the measurement of an object or space, which is informally defined, as there are only a minimum number of points needed to specify inside it. Dimensions are mostly used in mathematics of physics. Therefore, the dimension of a line is one because you need only one coordinate to specify a point on the line. A surface of a cylinder or plane will always have two dimensions because there are two coordinates specified in it. Thus in a cube or a sphere there are three dimensions because there are three coordinates in the space.
In physics, dimensions is used for referring to the constituent structure of the space. The entire concept of dimension is never restricted to physical objects. There are frequent occurrences of high definition spaces in mathematics. Knowing how to read dimensions is not difficult when you have the object whose dimension you want to mention in front of you. The best object for determining the dimension is a tire.
Here are some simple steps that will teach you how to read dimensions.
Steps:
- These steps are suitable for the tire P195-70-R14 90T. There are many tire sizes and it all starts with a letter, which will identify the type of the vehicle or the type of service that has been designated to this tire.
- This is what the things mean on a tire. P= P-metric or passenger. This is the most common service type, which signifies that the tire is well fitted on the passenger vehicle: light trucks, minivans, SUVs and cars. T= temporary spare, which means that the spare tire is hanging out from the trunk. LT= light truck metric, which means that the tire is fitted on towing trailers or trucks carrying heavy cargo. ST= it means special trailer service. This is always used on car trailers, boats or utility cars. These are not designed to be fitted on motor vehicles.
- Section width: There are three numbers after the first letter and they signify the width of the tires in millimeters. If you are going to measure the above-mentioned tire, then it will be 195 millimeters widthwise from the inner sidewall to the outer sidewall.
- Sidewall aspect ratio: After the section width, you will find two numbers that will identify the profile of the tire. For the tire mentioned in step one, the tire profile will be 70. An aspect ratio will indicate the height of the sidewall from the section width. If you have higher number then it means that you have taller sidewalls, and lower numbers will indicate shorter sidewalls.
- Internal construction: The letter after the two numbers, which represents the sidewall ratio, will denote the internal construction of the tire. As per the P195-70-R14-90T tire, R means radial, that is the most common tire construction. However, D would mean the diagonal construction, which is always used for the construction in the application of spare tires in light trucks.
- Tire and wheel diameter: The two numbers that appear after the internal construction denote the diameter of the wheel in the form of inches. As per the tire P195-70-R14-90T, the wheel and the tire diameter will be 14 inches. However, most of the new compact or luxurious cars are coming with 15-inch tires.
- Service description: The last set of numbers on the tire, which you need to know while reading dimensions is the letter indicating the tire load that carries the capacity index. That means it notes the maximum weight on tires and the speed rating that means that how fast the tires go. According to the example P195-70-R14-90T, it is 90T i.e. 90=1323 pounds maximum (600 kgs) and T= 118 MPH max (190km/h) for all the passenger cars.
- Now you know how to read dimensions of your car tire.
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