1. With the reference

Please note that there are some bearing references that are brand specific. If in doubt, check the measurements.

2. Measure the bearing

Using a caliper, measure:

- The inside diameter 

- Outside diameter

- The thickness

3. Headset bearings

Please note, the headsets bearings have angles (36° and 45°)

These values are essential to add to the dimensions mentioned above.

The example shows the dimensions to be measured. Often, they are written on the bearing.