Why Is a Balance Hole Necessary in a Bowling Ball?

Static Weight

• The static weight of a bowling ball is regulated by the United States Bowling Congress. The static weight of the ball is how much it weighs when not in motion. After the finger holes are drilled into the ball, the static weight of the ball must meet USBC standards. If the ball is too heavy, a balance hole is required so that the ball complies with the regulations. If the ball is too light, weights are often added to the finger holes. In this case, a balance hole may only be added for performance.

Performance

• The way in which a ball moves down the lane is influenced by where a balance hole is drilled on the ball. The ball's performance is dictated by the difference between the height of the core and its width. Drilling a balance hole into various spots on the core alter this difference, changing the behavior of the ball. Changing the height of the core creates a lower instance of hook and power. Changing the width increases power and hook. If the balance hole changes both equally, little change occurs.

Center of Gravity

• Where a balance hole is placed affects the center of gravity of the ball. For each type of motion a bowler requires from a ball, the balance hole should be placed in a specific location to create the appropriate center of gravity for the motion. For a strong ball that hooks further down the lane, the balance hole should be drilled low on the ball and to the right. For a strong ball that hooks quickly, the balance hole is best drilled near the back of the ball.

Testing

• A simple test can identify the best location for a balance hole for your particular style of bowling. Place several layers of tape in a color you can see from a distance over the location where you want to drill the balance hole. Throw the ball down the lane and monitor the tape. If the ball trembles when it hits the taped area, it's not the proper location for the balance hole. Move the tape and throw the ball again until you achieve smooth results.