Understanding the properties of the ball

? Three Key Properties of a Bowling Ball

1. CG – Centre of Gravity

• Definition: The CG marks the balance point of the ball's core. It’s usually indicated by a small dot or marking on the surface of the ball.

• Function:

  • Helps determine the drilling layout.

  • Affects how the ball transitions through the skid, hook, and roll phases.

  • Closer to the grip, the reaction will be smoother.

  • Farther from the grip, it can create more flare potential (depending on the layout).

  • With the new regulations regarding the balance hole, as well as today’s equipment, it has become less of an important factor than it used to be.

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2. PIN

• Definition: The PIN is the distance between the top of the core and the CG, shown as a small coloured dot on the ball.

• Function:

  • Affects the flare potential and length of the ball before it begins to hook.

  • A shorter PIN (e.g. 1–2") will create an earlier hook, more controlled motion.

  • A longer PIN (e.g. 4–5") will create more length and a sharper backend reaction.

• 3. Mass Bias (MB)

  • Definition: Present in asymmetrical balls, it's the point where the core is imbalanced — usually marked with a symbol (e.g., a line, dot, or "MB" logo).

  • Function:

    • Controls the shape and sharpness of the hook, especially in the backend phase.

    • Crucial for advanced layouts — especially in high-performance balls.

    • Placement of the Mass Bias affects how quickly and how strongly the ball changes direction.