We have test fitted thousands of different vehicles for proper fitment. For most cars, this won't work correctly. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside.
When the width of the wheel changes, the offset also changes numerically. If the offset of the wheel is not correct for the car, the handling can be adversely affected. "Deep dish" wheels are typically a negative offset. The hub mounting surface is toward the back or brake side of the wheels centerline. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars. The hub mounting surface is toward the front or wheel side of the wheel. The hub mounting surface is even with the centerline of the wheel. Installing a wheel with less rear of wheel backspacing than the factory wheel results in the wheel sticking out further than the stock wheel did. Most all factory truck wheels are positive offset to one degree or another. This type of wheel usually has a "deep" look as compared to a zero or positive offset wheel. A wheel with a -12mm offset would have a hub mounting surface 12mm inside of the wheel centerline, or closer to the back side of the wheel lip. Think front wheel drive car wheels for reference. In this case "0" is the centerline of the wheel which means a +12mm offset is a wheel with a hub mounting surface 12mm (roughly just over half and inch) further outwards toward the front of the wheel. In this example a +12mm wheel would be a positive offset wheel and a -12mm wheel would be a negative offset wheel.
A common "offset" for example is +12mm or -12mm. When chosing wheels it is important to pay attention to the backspacing. The offset can be one of three types (measured in millimeters).* Wheel backspacing is the distance from the hub mounting surface to the inside wheel lip (back side of the wheel) and is usually measured in inches. The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. or Metric comparisons.TIRE/WHEEL SIZING GUIDE Offset - Backspacing It is an adjustment faster or slower from the original speed. Adjusted Speedometer Reading is what speed the car will need to go if using the after market tires, to be traveling at the same speed if the car had the original tires on. Tires button in the top calculator or Compare Metric Tires in the lower calculator to have the selected tire sizes compared. After the data entry of the required information, click on the Compare U.S. The 195 is the tire width in millimeters, measured from the bottom of the bead to the bottom of the bead, the 70 is the sidewall aspect ratio, the ratio of sidewall height to tire width at the tread (indicating that the sidewall height is 70% of the tread width), and the 15 is the wheel rim diameter in inches. The following is an example to help to decode a tire size like 195/70R15. The tire tread width, sidewall (aspect) ratio, and wheel rim diameter from each of the two tires to be compared, along with a speedometer reading used to compute the effect the after market tire size has on your speedometer's accuracy. The information in the Required area is needed to perform the comparison. Calculations are to be treated as approximate only, due to possible and probable variations in how tires are manufactured. All calculations are designed to round up. designation tires and one for metric TRX designation tires. Compare information of original equipment tire size and alternate after market tire sizes. These calculators require the use of Javascript enabled and capable browsers. U.S And Metric Tire Size Information Calculator
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