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Outer shell of the ball
HP Gen 3 Pearl
Surface texture on the ball (sanded, polished, etc)
4000 Sanded
Lane Condition
Length and/or amount of oil on the lane
Medium-Heavy to Medium
Color of the ball
Black Emerald
Available weights
12-16 LBS
Weight block inside the ball
Modified Leggo
Core Type
Basic shape type of the core (Symmetric, Asymmetrical, Pancake)
Modified Leggo
Radius of Gyration: measurement related to weight distribution of the core. This affects how quickly a ball will get in to a roll. A ball with a higher RG will roll later. A ball with lower RG will roll sooner.
14 LB. - 2.58
15 LB. - 2.57
16 LB. - 2.56
Difference between the RG of the core's x-axis and y-axis. Indicates track flare potential and stability. A higher differential means more flare potential and less stabilty. A low differential ball will be more stable and have less flare potential.
14 LB. - .050
15 LB. - .057
16 LB. - .053
Intermediate Differential 
Difference between the RG of the core's x-axis and Z-axis on an asymmetrical core. Indicates the asymmetry of the core. A higher intermediate differential ball will be less stable and will transition more quickly from skid to roll than a ball with lower intermediate differential.

920A Honor Roll

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  • Mike Heap JR300

920A Product Notes

Manufacturer's Intent

The 920A was designed to be more Angular on medium/heavy oil patterns. Built on the LEGGO core platform, the designers modified it by raising the RG to 2.57 and tweaking the horsepower of the core (Intermediate Differential) to .020, thus gaining extra length while still having plenty of hitting power. The coverstock chosen for this ball is the HP Gen 3 with Performance Pearl. The Pearl helps to make it more Angular on the backend. The surface is 4000 grit Abralon® sanded. Each new ball from Track will include a microfiber cleaning pouch with instructions on its use.

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