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Use and distribution of this article is subject to our terms and conditions
whereby's information and copyright must be included. RG Specifications

Understanding the RG Specifications numerical references in our bowling ball product articles will help you make a good decision in purchasing your next bowling ball. The RG Specifications is one key factor relating to bowling ball construction and points to the skid length potential rating a given bowling ball possesses.

The United States Bowling Congress defines the RG (Radius of Gyration) of a bowling ball as a measurement in inches and is the distance from the axis of rotation at which the total mass of a body might be concentrated without changing its moment of inertia. describes RG as a measurement by some manufacturers in a range from 2.460 to 2.800, but some companies have converted them to a 1-10 scale to help give the consumer a better frame of reference. The Mass distribution numbers describe the distribution of mass in the given bowling ball and RG is an account of the location of that mass inside the given bowling ball.

High RG numbers indicate that the ball's mass is distributed more towards the cover (cover heavy) which promotes length through the heads of the bowling lane. Low RG numbers indicate that the balls mass is distributed more towards the center (center heavy) which promotes an earlier roll through the front part of the lane. Medium RG describes sufficient bowling ball skid length to reach the mid-lane before transitioning into the hook phase of overall motion.

Placing RG range measurements into three relative numerical spreads would be as follows:

Low RG: 2.460 - 2.570

Med. RG: 2.570 - 2.680

High RG: 2.680 - 2.800

As an example of our RG Specifications reference, let's look at the posted specifications in our article titled Nexus f(P) Pearl which is available for purchase at our site:

Release Date: 11/11/2011

Perfect Scale®: TBD

Performance: Pro Performance(10)

RG: 2.558

Differential: 0.056

Breakpoint Shape: Projection

Lane Condition: Medium-Heavy

Finish: Polished

Coverstock: Reactive Resin

Coverstock Name: Addaptive ƒ(P) Pearl

Factory Finish: 500; 1,500 Siaair Micro Pad; Rough Buff Finish

Color: 3-Color, Black, Blue and Silver Pearl

Core Type: Asymmetric

Core Name: Nexus Arrowhead

Quality: First Quality

Brunswick Product Line: Pro Performance
Please note all of the technical data details reference for the Nexus ball and make special note of the reference to the highlighted RG Specification as 2.558, or for practical purposes, 2.560. According to our informal chart above, this ball would fall into a low RG rating and is advertised to match with Medium-Heavy oil conditions.

Next time you are searching for a new ball at our site, please check out the description details and the RG specifications to help you select a new ball with the appropriate length potential rating.

Please be reminded that the core type engineered by the manufacturer is how the RG numerical rating is achieved. Another factor which can control skid potential is the coverstock surface texture which can be altered or modified on any given bowling ball to help you fine tune the skid length of any given bowling ball.

When you are ready to place an order, simply follow the online instructions. Thanks for visiting

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