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PSA – How Fast Asymmetrical Cores Transition
Differential shows how much total direction change a ball can make.
Intermediate Differential (PSA) shows how fast that direction change happens once it starts.
High Intermediate
FRICTION
TRANSITION ZONE
Low Intermediate
FRICTION
TRANSITION ZONE
INTERMEDIATE DIFF IN ACTION
See how two bowling balls with similar Rg and Differntial react with differnt intermediate ratings.
High Intermediate
RG: 2.51
Diff: 0.051
Int: 0.016
High Int. Diff: transition curve is steeper, compresses into a quick change.
Low Intermediate
RG: 2.50
Diff: 0.056
Int: 0.008
Low Int. Diff: transition curve is stretched out, arcs smoothly before finishing.
Benefits of Higher vs Lower Intermediate Differential
Higher Intermediate Diff (strong PSA):
- Once friction is encountered, the core transitions faster
- Motion becomes sharper and more angular
- The breakpoint looks quick and defined
- Often creates a “flip” look rather than a smooth arc
Lower Intermediate Diff (weaker PSA):
- Once friction is encountered, the core transitions slower
- Motion blends out and looks smoother
- The breakpoint appears rounder
- Can resemble the motion of a symmetrical ball