Voids are a manufacturing flaw we sometimes find with our Ultrasound scans on fork steerers.

No visible indication is present on the surface and sometimes people don’t believe that there is a problem.

As an example we cut a section out of a fork steerer that was rejected for having a void, as the photo below clearly shows there are large voids or air pockets in this area of the fork.

Note also that the voids are at multiple depths.

Having voids like this significantly reduces the strength of the steerer. Remember the steerer is critical to the control of your bike, you really do not want it to fail.

Also note that this flaw is not limited to one brand, it is a process problem.