Infiniti Q37x 2010

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A customer walked into our showroom and was like. I am looking for something different. So Craig, 1 of our tech guy said, “I have something that will make your car stand out from the rest.” The client said, “If you can do that I will purchase my next set of rims from you guys.”

So Craig went for 1 of our newest wheels from our Zeba Collection, “Copper Bronze.” Now if this is not different, I do not know what is.

Infiniti Q37x 2010 with Zero Copper Bronze 20x8.5 Rims

Understanding what is offset and how it works

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The offset of a wheel is the distance from its hub mounting surface to the centerline of the wheel. The offset can be one of three types:  

Zero Offset

The hub mounting surface is even with the centerline of the wheel.


The hub mounting surface is toward the front or wheel side of the wheel. Positive offset wheels are generally found on front wheel drive cars and newer rear drive cars.


The hub mounting surface is toward the back or brake side of the wheels centerline.

"Deep dish" wheels typically have negative offset or a very low positive offset.

Calculating the Offset of a Wheel

Calculating the offset of a wheel is a fairly easy mathematical equation. First, measure the overall width of the wheel (remember, just because a wheel is 18x7.5, does not mean that the OVERALL width is 7.5”. It means that the measurement from outboard flange to the inboard flange is 7.5”). Next, divide that width of the wheel by two; this will give you the centerline of the wheel.

Overall width/2 = Centerline

After determining the centerline, measure from the mounting pad to the edge of the inboard flange (if the wheel were lying flat on the ground – face up – your measurement would be from the ground to the mounting pad). This is your back spacing.

Centerline – Back Spacing = Offset in Inches

Inches x 25.4 = Offset in mm

Determining the Right Offset for Your Car

Short of adding fender flares or a body kit to your car or rolling and pulling your fender wells, there is no way to significantly change your car’s offset. If your car has a high offset, you will have to buy a high offset aftermarket wheel. If your car has a low offset, you will need a low offset aftermarket wheel. Typically, front wheel drive vehicles have a high offset (+35 mm or greater), and rear-wheel drive applications will have lower offsets (this is not true in all cases, as the Honda S2000 is rear wheel drive, and has a very high offset). Your installer or tire and wheel dealer should be able to tell you what the offset of your vehicle is.

The common definitions are:

Low – 0-15 mm

Mid – 16-34 mm

High – 35-40 mm

High + - 41+ mm

Other factors in determining what offset is right for your vehicle is whether not you are making any other changes to your car (lowering or raising, aftermarket brakes, etc.).

If the offset of the wheel is not correct for the car, the handling can be adversely affected. When the width of the wheel changes, the offset also changes numerically. If the offset were to stay the same while you added width, the additional width would be split evenly between the inside and outside. For most cars, this won't work correctly.

What does PCD stand for?

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The bolt circle is the circle determined by the positions of the bolts; the center of every bolt lies on the circumference of the bolt circle. The important measurement is the "pitch circle diameter" (PCD), usually expressed in millimeters, although inches are sometimes used. For a 4- or 6-bolt car, this measurement is merely the distance between the center of two diametrically opposite bolts. In the 4-bolt picture this would be the distance between 2 opposite holes.

Some basic geometry is needed to find the center of a 5-bolt pattern: But basically, the PCD can be found by multiplying the center distance between any two adjacent holes by 1.701. Or just draw an imaginary circle throught the center of all holes, now measure the diameter of this circle.

Information for the day.