How to Measure Hub Centric Rings

To choose the right hub centric ring, you need two measurements: the car hub diameter (inner size) and the wheel center bore diameter (outer size). Here's how to measure both.

1. Measuring the car hub

The car hub is usually easy to measure with a caliper. Measure the outer diameter of the hub — this is the surface where the hub centric ring sits. The result is the inner diameter of the ring you need.

You can also find your hub size in your car's technical specs or on our car model page.

2. Measuring the wheel center bore

The wheel center bore is best measured with a proper tool. The challenge with regular calipers is that they often don't fit inside the wheel to measure the center bore directly.

Solution: measuring with a wedge

If your calipers don't fit inside the wheel, you can measure the center bore like this:

1. Make a wedge-shaped piece from stiff cardboard
2. Insert the wedge into the wheel center bore so it touches both edges
   
3. Mark the points where the wedge touches the edges of the bore
   
4. Measure the distance between the marks with calipers — this is your center bore diameter. Note: this method may have a small margin of error, but when you compare with available sizes, you'll likely find a match!

3. Measuring from an old hub centric ring

If you already have old hub centric rings, you can measure the correct size directly from them! Use calipers to measure the outer diameter (= wheel center bore) and inner diameter (= car hub). This gives you both measurements at once.

4. Choosing the right hub centric ring

Once you have both measurements, the ring size is:

Wheel center bore → Car hub
For example: if the center bore is 73.1 mm and the hub is 57.1 mm, you need a 73.1 → 57.1 hub centric ring.

Browse all hub centric ring sizes or find by car model.

Need help measuring?

Not sure about your measurements? Contact us — we're happy to help you find the right size!