All / Wheel bolt Patterns n Tire Sizes

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Copy n Pasted' ........ So double check your own wheels before buying / trading or useing this chart ThumbUp

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Bolt circle size: The bolt circle represents the diameter of an imaginary circle that goes through the center of the bolt holes (A). On a four-lug wheel, this is determined by measuring the distance between opposite holes (B). For a five-lug application, measure the center-to-center distance between two adjacent wheel studs (C) and reference the table below,

2.645 in. = 4 ? in. circle

2.792 in. = 4 3/4 in. circle

2.939 in. = 5 in. circle

3.233 in. = 5 ? circle
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Offset: The distance from the centerline of the wheel to the face of the mounting surface of the wheel that contacts the hub.

Negative offset: Indicates the mounting pad is behind (or inboard) the centerline of the rim. This is often found on standard rear-wheel-drive vehicles and on so-called reversed rims.

Positive offset: Refers to wheel s that have the mounting pad in front (or outboard) of the centerline of the rim. Most often found on front-drive applications.

Centerline: The exact center of the rim width. The width is measured between where the tires rest.

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Wheel Terminology link / http://www.offroaders.com/info/tech-corner/reading/wheels.htm
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Tires Terminology link / http://www.offroaders.com/tech/AT-MT-Tires/tire-tech.htm
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Looking at a tire marked LT305/85R16, the buyer knows that it is a 16-inch radial tire built for light trucks with an 85-percent aspect ratio and 305 millimeters of section width. To determine the height of the tire, you must calculate its section height in inches, dividing by 25.4, the number of millimeters in an inch (see equivalency chart). Next, convert the aspect ratio to a decimal by dividing by 100. Multiply the quotients of these two numbers to find the section height in inches. Double that figure and add the wheel diameter, and you will have the tire?s height. Using a 305/85R tire as an example, the equation works out as:

2 x section width x aspect ratio x aspect ratio + wheel size
25.4 100

2 x 305 x 85 + 16 = 36.4 inches
25.4 100

Some of the most popular tire sizes, and their approximate metric equivalents, can be found in the chart below.

Flotation Diameter (in.) Metric size
27x8.50R14 26.5 225/75R14
27.5 215/75R15
29x9.50R15 28.5 235/75R15
30x9.50R15 29.5 245/75R15
31x10.50R15 30.5 265/75R15
32x11.50R15 31.5 295/75R15
33x12.50R15 32.5 315/70R15
33x12.50R16 32.8 285/75-16
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.Rim Size P-Metric Size Actual Tire Width Actual Tire Height
15 Inch 205/70R15 8.7 inches 26.2 inches
215/75R15 8.45 inches 27.6 inches
235/75R15 9.25 inches 28.8 inches
265/70R15 10.4 inches 29.6 inches
16 Inch 245/75R16 9.65 inches 30.4 inches
245/75R16 11.2 inches 32.8 inches
285/75R16 12.4 inches 34.6 inches
315/75R16 15.5 inches 37.7 inches
17 Inch 235/65R17 9.25 inches 29.5 inches
265/70R17 10.4 inches 31.6 inches
255/75R17 10.4 inches 32.0 inches
285/75R17 11.2 inches 32.7 inches
315/70R17 12.4 inches 34.3 inches

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