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Asymmetric Bowling Balls, Originally Posted: 6/3/2012; Updated: 4/29/2024

Understanding more about asymmetric bowling balls can be a help in selecting your next bowling ball. Bowling ball symmetry varies from ball to ball based upon certain factors engineered into the ball construction process. Familiarizing yourself with asymmetric bowling balls is also a step in understanding bowling ball motion and in attaining a definitive back end reaction on the lanes.

Let's examine asymmetric bowling balls:

Asymmetrical Core (undrilled) - A ball where the RG (radius of gyration) values of the Y (high RG) and Z (intermediate RG) axes of the ball differ by more than 5% of the total differential of the ball.

Asymmetrical drilled balls show a defined, angular motion. These balls can create more area at the break point and will respond to friction faster at the break point than symmetrical balls.

It has been proven through United States Bowling Association (USBC) field studies that all drilled bowling balls are asymmetrical, whether they are symmetrical or asymmetrical before drilling.

The term differential in a bowling ball can be defined as the difference between the maximum and minimum Radius of Gyration. Radius of gyration, RG, is measured in inches and is the distance from the axis of rotation at which the total mass of a body might be concentrated without changing its moment of inertia.

The differential of RG measurement indicates the bowling ball's track flare potential. The higher the number the greater the track flare potential.

A key to ball motion is intermediate differential which is the measure of a bowling ball’s degree of asymmetry. The larger the differential ratio, the more asymmetrical the bowling ball. Conversely, the smaller the differential ratio, the less asymmetrical the ball.

If you wish to view some of the latest asymmetric ball equipment rolling down our test facility lanes, please check out our ball review videos at our site.
We also recommend you consult your local pro shop professional or our "Drilling Layouts" feature on our home page before choosing your next bowling ball so you may evaluate the important drilling layout options to help you achieve a desired ball motion. has become the No. 1 "e-tailer" of choice for bowling equipment by the consumers of America. If you are ready to make a purchase, simply follow the easy online order instructions. Thanks for visiting

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