Roto Grip RST X2 Bowling Ball vs 900 Global Zen – My Two FAVORITE Pearl Bowling Balls Right Now

The S77 Response™ Pearl Coverstock was the obvious choice to follow up on the success of the S77 Response™ Solid coverstock. The Pearl version of this cover will provide the most skid/flip reaction we have ever put in the 800 Series. The Zen™ will be a great ball to open up your angles with on medium-heavy patterns.

The Meditate™ Core is the biggest core we have ever put into a bowling ball!! A bigger core means more hitting power combined with a more consistent reaction. Throughout testing the Meditate™ Core provided that wide “footprint on the lane that all bowlers love to see. The Zen™ pushes the limits of core dynamics.

Coverstock: S77R™ Pearl
Weight Block: Meditate™ Symmetric
Factory Finish: 1500 Polish
Flare Potential: 4-5″
Radius of Gyration (RG): 15lbs – 2.49
Differential (Diff): 15lbs – .051
Intermediate Differential (Diff): 15lbs – N/A

Given the continued success of the RST™ X-1, we knew the next ball in the series using the Roto Star Tour Core was going to need a special coverstock wrapped around it as well. So, after countless tests involving multiple players of different styles, we determined that the eTrax™ pearl material gave us the type of reaction we were looking for, but we wanted something a little more while still using that same chemistry. So, the R&D team went to work changing the ratios and other variables until we settled in on the NEW eTrax™ PLUS Pearl Reactive formula that provides a larger footprint throughout the entire lane without reducing the responsiveness to friction down lane. Creating yet another viable pearlized coverstock option for the Roto Grip family of balls.

Professional bowlers like to see continuous motion down lane with minimal deflection as the ball enters the pocket due to their rev rates usually being on the higher side. This logic was the basis of development by the R&D team as they looked to create a core that would maintain dynamics after drilling in order to maintain a higher level of core torque down lane. The larger mass at the base of the core does indeed create that. Especially since when drilled, the thumbhole will always end up in the void area not really affect the bottom mass of the core. Thus, making this core a “Tour Level” type core design better known as the Roto Star Tour Core (RST™ Core).

Coverstock Name E-Trax™+
Coverstock Style Pearl
Coverstock Type Reactive
Weight Block RST™ Core = Roto Star Tour™ (Asymmetrical)
Color Tanzanite
Finish 1500 Polished
Finish Method Can be Polished OR Can be Sanded More
Durometer 73-75 on D-Scale
Flare Potential High
Weights 16lbs – 12lbs

RG: 2.53
DIFF: .053
PSA:.016