I have an RSX I have not used in a year but I just noticed it has a crack running from the thumb hole about 5 " long. What could cause this. I live in Va an the ball has been in my basement on a ball rack with several others yet this is the only one that cracked?
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Todd Loy
Roto Grip King of Them All!!!!

Seems to be that you shouldn't leave them sitting around.  I've had one ball crack Bruns Navy Fuze.  During summer in closet.  Me thinks either use 'em or lose 'em.  
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Scott

I've had a number crack over the past couple of years (2 Velocities, Max Velocity, Tornado, Jungle Green Predator). These were complete, ball trashing cracks.

In all cases there were sitting on the ball rack in my garage. The only thing they had in common was a lack of use.

I was lucky enough to see the predator crack...I was moving it over on the rack to add another ball...it bumped the ball next to it will a very dull dud...I watched the crack move in slow motion completely around the ball.

In my experience, the only balls I have seen crack are ones where the finger/thumb hole was not beveled (spider-web), the bridge was less than 1/4 inch, pin was partially drilled out, coverstock was way too brittle (Catalyst), bad batches came from plant (example- Paradigm), excessive heat/cold.
Out of the thousands of balls I have drilled, I have had one crack that was sitting in a locker at another bowling center, going un-used for two weeks.  My belief is that since the locker was located next to an exit door made of glass, it must have gotten too hot (being it is late august)and then cooled rapidly by the A/C vent located directly above the locker.
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James McCarter
Co-Owner/Operator
The Bowlers Solution INC
Roto-Grip Staff Member