Do you have any information on that I can look at to do some further reading and research? Or do you want to explain what you mean and why?
Intuitively to me, I’d assume the larger diameter would mean slightly more mass therefore the cueball would deflect more. Or I would assume they balance the foam inside to ensure they both have the same end mass and impart the same deflection on the cueball. I can’t diss out why the 12.9 would have less deflection.
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The word I heard is that the walls of the 12.9 are thinner due to the taper so the end mass is actually less than what it is in the 12.4.