How does the performance of the new ACX limbs compare to the original design limbs of the same lenght?
How does the performance of the new takedown shorty bow in 58-60" lengths compare to the original design bow with 62" limbs for someone with 28-29" draw.
JohnV, the ACX limbs offer the same energy storage efficiency and the same dynamic efficiency, so they will shoot the same speed. The difference is: a) lighter in weight because of the carbon wedge, and b) a bit quieter because of the carbon wedge. Obviously the appearance is different too because of the carbon overlays.
The whole idea about the new short line of 3PTD's was to equal the performance of our best longer bows in a shorter package. The short answer to your question is that a 58" or 60" new short 3PTD will store a bit more energy than the original 62" limbs on an original 14" riser and therefore will shoot a couple/three fps faster.
Joevan, I have a simple solution for you: buy both risers (I know, easy for me to say right?).