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WHAT IS A CENTERBORE?

The centerbore 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 milimeters), is the measurement of the Centerbore.  This opening allows the hub of a vehicle to fit through the wheel and mount onto the vehicle itself.

In certain cases, some of our wheels are specifically machined to precisely match the original factory hub-size of your vehicle.  This type of centerbore is commonly referred to as "Hub-Centric."

In the majority of our wheels, the centerbore is machined to a larger diameter than the original factory hub-size of your vehicle, which will allow for a wider range of fitment possibilities.  This type of centerbore is commonly referred to as "Lug-Centric."  In the case of Lug-Centric wheels, you can also use Hub-Centric Rings, which effectively reduces the bore size to match the hub of your vehicle.  For your convenience, Topline Products sells a wide variety of Hub-Centric Rings to fit all your vehicle requirements.

While neither centerbore designation can be considered technically superior to the other, it is important to remember that with both Hub-Centric and Lug-Centric wheels, you should torque the lug nuts/bolts with the vehicle lifted off the ground surface.  In the case of Lug-Centric wheels, the lug hardware will center itself onto the wheel, and torque down without allowing the vehicle’s weight to force the wheel off-center.

Diagrams #1 and #2 show different types of centerbores.

 
Diagram #1
 
Diagram #2
 
 

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