Did You Know? Storm Bowling Ball Core Shape
bowlingball.com 3/22/2017
DID YOU KNOW…
Bowling ball cores can be either symmetrical or asymmetrical in shape. Asymmetrical cores are not the same shape from one side of the core to the other. This creates the presence of a preferred spin axis or PSA, in which the ball wants to migrate to. To show the strength of the PSA, we use a measurement called the intermediate differential. This number defines how asymmetric the shape is. The higher the number, the stronger PSA will be. Asymmetrical cores will tend to produce faster transitions as the ball goes from skid to hook to roll. This will give the bowler a stronger and more angular motion down the lane. Asymmetrical ball motion can be fine-tuned much more than symmetrical ball motion because of this PSA.
Symmetrical cores are much simpler. They are the same shape from one side of the core to the other. They will tend to produce slower transitions as the ball goes from skid to hook to roll. This will give the bowler a smoother more predictable motion down the lane because there is not a strongly defined PSA causing the ball to transition faster.
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