The Legal Specifications of Bowling Balls

Bowling balls have specific requirements and are regulated to ensure fairness of play. All balls used in competition need to be approved by the league. Regulations on weight, diameter and circumference, ball surface and branding are all set out by the league. These rules exist to ensure all bowlers are using safe, equal and fair equipment.

  1. Weight and Measurements

    • A bowling ball has no minimum weight but it cannot weigh more than 16 pounds. The circumference of the ball should be 26.704 to 27.002 inches and the diameter should be 8.5 to 8.595 inches, according the United States Bowling Congress.

    Damaged Balls

    • Any bowling balls with cracks in them cannot be used in competition, according to the United States Bowling Congress. The USBC defines a crack as a “narrow opening or crack of considerable length and depth usually occurring from some breaking or parting.”

    Ball Accessories

    • Ball accessories and cleaners must be approved by the United States Bowling Congress. If a bowler uses powder or rosin for grip, the substance should be wiped off before a ball is played. The substance cannot be used anywhere on the ball other than in the finger holes. The USBC has a complete list of all approved substances, like gripping aids, polishes, buffers and cleaners that players can view before buying a product. The ball’s surface must always be unaltered and unmodified.

    Approved Balls

    • The United States Bowling Congress has a list of approved bowling ball types. Any of the balls on the list can be used in competition. The list is organized alphabetically by ball name and brand and also has the date of all balls approved since 1991.

    Serial Numbers and Branding

    • All bowling balls used in competition must have a visible serial number. If the serial number is worn off or scratched off a new serial should be engraved onto the ball. The United States Bowling Congress also requires the original product name and manufacturer’s name to be visible.