# Tire Width Chart

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.

Rim width and tire width are two closely related sizes. Flexible tire sidewalls alow a single tire size to be mounted on a rim of various widths.

Find your sidewall width or size in left column. Move right to find your Aspect Ratio column (AR, may be on the sidewall or mfg.’s specs). Number in the box + your rim diameter = tire’s outside diameter (height).

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.

These codes are typical for Harleys but can be for any tire. The codes do not go beyond 150mm in width. With these tires, the first number of the tire size is not the actual width, it is just a number.

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.

The values shown are calculated measurements based on the p-metric formula. Actual advertised tire height and tread width will vary from manufacturer to manufacturer for specific p-metric tire sizes.

Calculating Tire Dimensions. Modern metric tire dimensions Example...185/60R14 85H or 185/60HR14. The first number is the width of the tire in millimeters, measured from sidewall to sidewall.

This section is for any vehicles equipped with large, aggressive tires, similar to those made by Interco, BFGoodrich, Toyo, Mickey Thompson, and PitBull, although the data can be applied to any manufacturer of similarly sized tires.Make sure you check the "Ply" column when making your selection.

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• ### Tire Sizing Systems Sheldon Brown

ISO, the International Organization for Standardization has developed a universal tire and rim sizing system that eliminates this confusion. This system was formerly known as the “E.T.R.T.O.” system, developed by the European Tyre and Rim Technical Organisation The ISO system uses two numbers. The first is width in millimeters..

• ### Tire Width For A Wheelrim Size Chart Tyresizecalculator Com

Tire width for a wheel rim size chart for e.g. answers the question What tire width range is adequate for 6 inch rim?.

• ### Tire Size And Width Chart Victorylibrary Com

Find your sidewall width or size in left column. Move right to find your Aspect Ratio column AR, may be on the sidewall or mfg.’s specs . Number in the box your rim diameter = tire.

• ### Tire Tech Information Tire Size Conversion Chart

While today’s P metric passenger tire sizes have existed since the early 1980s, restoring classic muscle cars and pony cars has kept yesterday’s numeric and alpha numeric tires from disappearing. This chart has been developed to help you determine their equivalent Euro metric and P metric tire .