Originally Posted by tlm
If a more elastic string that slides more is better for spin then why does kevlar which is very stiff and non elastic put so much spin on the ball?
That was exactly my point, it's a conundrum. Greater stiffness yields higher spin potential, but greater elasticity also yields higher spin potential. My theory, which is my reasoning alone, is that gut yields good spin because it is so elastic that it's able to overcome a lot of the string-string friction. Kevlar, which has extraordinary ball-string friction will also yield good spin potential. Whether this is true or not, I have no idea, but I DO know that it's because poly can combine the best attributes of both of these string types and meet in the middle that it's far superior than either with regards to spin potential.