Bottom Weight: The weight of a bowling ball is not always evenly distributed in the sphere. ABC rules allow a ball to vary 3 ounces from the drilled top half to bottom half of a ball, and one ounce from the left to right side. Before resin balls, these weights were used to subtly change the roll pattern of a ball. A ball that had higher top weight would tend to go longer before hooking; a ball with bottom weight would tend to roll earlier. Although still used in ball drilling layouts, it is less important with the modern ball.

 

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Bottom Weight: The weight of a bowling ball is not always evenly distributed in the sphere. ABC rules allow a ball to vary 3 ounces from the drilled top half to bottom half of a ball, and one ounce from th . . . View Full Definition

Top Weight: Drilling of a ball so that there is more weight above the label than there is below; it is considered a positive weight. See bottom weight.

Negative Weight: Weight on a ball that tends to hold back the hook and/or to get the ball into a roll earlier; bottom weight, negative side weight and thumb weight are considered negative weights. These are . . . View Full Definition

Swing Weight: The relative weight of a clubhead's leverage (usually measured on a scale with a 12 or 14-inch fulcrum), technically - moment of inertia, or the tendency of a body to resist angular accelera . . . View Full Definition