![]() The hub-mounting surface is toward the front or road/outside side of the wheel. The hub-mounting surface is even with the centerline of the wheel. Since the sixties Volvo has pretty much stuck with positive offset wheel designs. If the offset of the wheel is not correct for the car, the handling can be adversely affected and in most cases will cause severe rubbing. The offset of a wheel is the distance from its hub-mounting surface to the centerline of the wheel. A few other cars use this bolt pattern, such as Ferraris and some Fords, but in most cases the offset is different enough to prevent the use of any wheels not built specifically for use on a Volvo. This indicates a 5-lug pattern on a 4.25 inch circle, which is pretty much unique to Volvo. Most Volvos* use a bolt pattern of 5 on 4.25 inch (108mm). The bolt pattern or bolt circle is the diameter of an imaginary circle formed by the centers of the wheel lugs. ![]() To calculate the outside diameter of a tire, take the sidewall height and multiply by 2 (remember that the diameter is made up of 2 side walls), then add the diameter of the wheel to get your answer. The last number is the diameter of the wheel in inches. Multiply that by the aspect ratio to find the height of one sidewall. In the example above, the tire is 7.28" wide. The aspect ratio is also sometimes called the "series". This is a ratio of sidewall height to width. The second number (70) is the aspect ratio. In the example above, the width is 185mm or 7.28". This dimension is also called the section width. ![]() The first number (185) is the width of the tire in millimeters, measured from sidewall to sidewall. Ultimately itÍs a choice that only you can make once you have gathered enough information. Add the subjective wheel styles to the picture and you can see how the process can become very time consuming. ![]() Budget, local weather and geographical considerations, driving style, ride quality, road noise, and tire life all factor in to choosing tires. Next to "Why won't my Volvo start?" the most popular question we get at ipd is "What size tires and wheels should I put on My Volvo?" This can be a tough question to answer, as there are so many variables to consider. ![]()
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