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General Wheel Information
What is a Center Bore?
The center bore of a wheel is defined as the circular opening running through the backside of the wheel. The diameter of this circle (which is generally measured in millimeters), is the measurement of the center bore. This opening allows the hub of a vehicle to fit through the wheel and mount onto the vehicle itself.
Hub-Centric vs Lug-Centric
In certain cases, some of our wheels are specifically machined to precisely match the original factory hub-size of your vehicle. This type of center bore is commonly referred to as “Hub-Centric.” However, most of our wheels are machined to have a larger diameter center bore than the original factory hub-size of a vehicle, which will allow for a wider range of fitment possibilities. This type of center bore is commonly referred to as “Lug-Centric.”.
What are Hub-Centric Rings?
Most aftermarket wheels are manufactured with a larger center bore that will fit a wide range of vehicles. A hub-centric ring is an installation tool used to help hold the wheel perfectly centered. The use of a hub-centric ring can help in reducing minor vibrations. Proper installation and torque sequence are required to correctly center a wheel with or without a hub-centric ring.
What is a Bolt Pattern or PCD?
A bolt pattern refers to the number of wheel lugs and a bolt circle is the arrangement of those lugs. A bolt pattern is often referred to as a "PCD" on Pitch Circle Diameter. Typically, most vehicles will have a 4 or 5 lug pattern, where trucks and larger vehicles may have 6 or 8. To determine the diameter of a bolt circle of a 4, 6 or 8 bolt pattern, measure from center to center between two holes directly across from each other. To measure a 5 bolt pattern, measure from the center of one hole to the back of the third hole. Bolt circles are generally expressed in millimeters..
What is the Offset of a Wheel?
The offset of a wheel is the distance from the hub mounting surface to the center line of the wheel. The wheel offset is measured in millimeters and results in a positive, negative, or zero offset. Positive offset is when the hub mounting surface is toward the front side of the wheels centerline. It is common to find a positive offset in newer and front wheel drive vehicles. Negative offset is when the hub mounting surface is toward the back side of the wheels centerline. A negative offset wheel will usually feature a deep lip or a drastic concave design. Zero offset is when the hub mounting surface is even with the centerline of the wheel.
What is the Backspacing of a Wheel?
Backspacing is an older system of measurement to determine how deep the mounting pad is located on the wheel. While offset was measured in millimeters, the backspace is measured in inches. The correct backspacing will allow enough room for the suspension, brakes and steering systems to operate without interference from the wheel. A positive offset creates more backspace, while a negative offset reduces the backspace.
What is Staggered Fitment?
A staggered fitment is also referred to as a staggered application. It basically means that the wheels on the front of the vehicle are a different size than those on the rear. Typically, on a staggered fitment the diameter of the wheel will be the same on the front and rear of the vehicle, the only difference is the rear wheels will have wider width. However, some vehicles may be staggered have staggered diameters and widths.