The USBC Equipment Specifications and Certifications Committee has adopted a new specification for all bowling balls approved for competition on or after July 1, 2010. The new specification will raise the allowable lower-limit radius of gyration (RG) measurement to 2.460 inches up from 2.430 inches. All bowling balls approved before the deadline will be grandfathered in under the current RG specifications, making them legal for future USBC-certified competition. The specification change will only apply to balls approved on or after July 1, 2010. For more information on this and other technical issues, visit the Equipment Specifications and Certifications area of bowl.com.