Hub Bore

Automotive Hub Center Bore Size

The relation between wheel centre bore and hub diameter

The centre bore of a wheel is the hole in the central part of the back of the wheel where the spigot fits through. Wheel hubs, located between the drive axle and brake drums, connect the wheels to the body of the car. Therefore, in order to fit the new wheels correctly, it is important that the car’s wheel hub size perfectly matches the wheel’s centre bore.

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Wheels terminology and definitions


A situation where the center bore hole of a wheel is made to match up with the hub diameter of the vehicle; the wheel is then centered by the center hole, rather than the lug nuts.


The centering of a wheel by matching it up with the attachment points (i.e. studs), rather than by the center bore hole of the wheel.


A steel bar, linking the left and right side of a suspension. It comes into play during cornering. As the car leans in a turn, the anti-roll bar resists this leaning by transferring more weight to the outside tire. It provides a means to achieve good handling from stiff roll resistance while maintaining the tire’s contact patch.


The dimensional relationship between tire section height and section width; section height divided by section width.


The measurement from the back of the bolt pad to the back edge of the rim; used to calculate offset and determine where the back of the bolt pad is located in relation to the rim width, sometimes referred to as rear spacing.


A uniform mass distribution of a tire and wheel assembly about its axis of rotation.

Center Bore

Center bore is the hole at the middle of the wheel on the hub of the car. Wheels are manufactured in huge numbers, they are not made with any vehicle’s center bore in mind, hence hub rings are always recommended. Most custom and aftermarket wheels are created with a center opening that will fit a variety of automobiles. Hub rings ensures that there are no fitment issues between wheels and hubs when fitting with each other.

Wheels can be non-hub centric by design, generally known as lug centric tires. Torquing is crucial to twisting the lug components with the vehicle on the jack as this process allows the bolts to center the rim and torque down. Read more on hub bore specs.

What Size is the centre bore of my Rim?

To get the right size Hub Ring, you need to first determine the centre bore size of your wheel hub. This means you need to remove your wheel to measure it, there is no magic list with the bore sizes of every wheel ever made. The best way to measure is with a Dial caliper or Digital caliper. If you don't have access to one of those tools, we created a template of the most common bore sizes. Click the HUB RING TEMPLATE link to download our Free Template to measure the centre of your wheel.

What Size is my vehicle's Hub?

Then you need to find out your vehicle's hub size, i.e. Vehicle Hub (Inner Diameter) or I.D. The size of your car's wheel hub is usually indicated in the user’s manual for the car. A good reference for vehicle Bolt Circles and Centre Bores can be found HERE.

The Hub Centric Ring will take up the space between your Wheel Bore and Hub. For example, if the diameter of the wheel hub is 67.1 mm, and the wheel centre bore is 73 mm, a centric ring with an I.D. of 67.1 mm & O.D. of 73 mm is needed in-between, so the right part is TOC73-6710.