Full Roller Layouts Symmetrical
Full Roller Layout Comparison for a Symmetrical Ball
We would like to thank you again for requesting this study for full roller layouts. The study has now been completed by performing an in-depth analysis on symmetrically cored bowling balls and the results can be found in the accompanying chart below. The aggressive layout for symmetrical bowling balls will differ from asymmetrical bowling balls due to the shift in PSA locations on symmetrical equipment. The recommended Pin Out and Top Weight specifications for the un-drilled ball are the same for both Symmetrical and Asymmetrical bowling balls. We look forward to hearing from those full rollers who try this aggressive layout on symmetrical equipment.
The Standard Full Roller layout places the CG ¾” right of the centergrip on the Midline and the Pin in the 7:00 position. We recommend a ball with a 3-4” Pin and 2.5 - 3 oz. Top Weight for the Standard Layout. No Balance Hole is used in this layout. I have included a picture for your review.
The Aggressive Full Roller layout places the CG 1” right of the centergrip and approximately 1” above the Midline while the Pin is placed in the 7:00 position 3 3/8" from the centergrip. The fingers are drilled to a depth of 4" to increase differential and a 7/8" Balance Hole is placed in the intended PSA 2 1/2” deep and pitched 1" away from the fingers. For comparison purposes, I included the mass properties Pre- and Post- balance hole. We recommend a ball with a 4-5” Pin and 2.5 - 3.5 oz. Top Weight for the Aggressive Layout. Again, I have included a picture for your review.
The accompanying chart includes the mass properties for the un-drilled and drilled balls. Notice that the un-drilled balls begin with the recommended Pin Out distances and Top Weight values for each layout. A negative value of finger weight for the aggressive layout using the 1 ¼” Balance hole indicates thumb weight. Feel free to ask any further questions and please provide feedback. Thanks..
Steve Freshour
