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Tire Size Explanation. You are one step away from getting a detailed, color-coded explanation of a specific tire code. Just click on a size below to get a break down of what it means.
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Alpha numeric tire sizes were introduced as Original Equipment in the late 60s and became widely used in the early 70s. These tires were identified with a letter which indicated the tire's load capacity, followed by an "R" if radial ply construction, the tire's aspect ratio and wheel diameter.
Automobile tires are described by an alphanumeric tire code (in American English and Canadian English) or tyre code (in British English, Australian English and others), which is generally molded (or moulded) into the sidewall of the tire. This code specifies the dimensions of the tire, and some of its key limitations, such as load-bearing ability, and maximum speed.
Inch-based designations sometimes express the width in a decimal (26 x 1.75) and sometimes as a common fraction (26 x 1 3/4). This is the most common cause of mismatches. Although these size designations are mathematically equal, they refer to different size tires, which are NOT interchangeable.
What’s a tire ply rating? A tire ply rating is an expression of the tire’s strength and capacity. The ply rating translates in a very direct way to tire capabilities and limitations, especially when it comes to inflation and load capacity.
Just Tires sells tires of all sizes - visit our website to learn more about understanding tire size, how to read it, and where to find the right tires for your car.
(Lea en español) Rim Width Range. Because tires have flexible sidewalls, a single tire size will fit on a variety of rim widths. A tire's rim width range identifies the narrowest to the widest rim widths upon which the tire is designed to be mounted during its tens-of-thousands of miles and years of service.
ISO 5775 is an international standard for labeling the size of bicycle tires and rims.The system used was originally developed by the European Tyre and Rim Technical Organisation (ETRTO). It is designed to make tire sizing consistent and clear. It replaces overlapping informal systems that ambiguously distinguished between sizes.
Explanation of the Input Data: The chosen rim width is usually in inches. A rim size of 8Jx17 has a width of 8" or 203.2 mm. As a rule-of-thumb, you may choose a narrower or wider rim by ½ inch, but it’s wise to check with the specific tire manufacturer for their approved rim sizes.