Ping ISI vs Ping i3 O-Size
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | ISI loft | i3 O-Size loft | ISI lie | i3 O-Size lie | ISI length | i3 O-Size length |
|---|---|---|---|---|---|---|
| 3 | 20.5 | 20.5 | 60.5 | 59.5 | 38.75 | 38.75 |
| 4 | 24 | 24 | 61 | 60 | 38.25 | 38.25 |
| 5 | 27 | 27 | 62 | 61 | 37.75 | 37.75 |
| 6 | 30.5 | 30.5 | 62.5 | 61.5 | 37.25 | 37.25 |
| 7 | 34.5 | 34.5 | 63.5 | 62.5 | 36.75 | 36.75 |
| 8 | 38.5 | 38.5 | 64 | 63 | 36.25 | 36.25 |
| 9 | 42.5 | 42.5 | 64 | 64 | 35.75 | 35.75 |
| PW | 47 | 47 | 65.5 | 64.5 | 35.5 | 35.5 |
| UW | 49.5 | 52 | 65.5 | 64.5 | 35.5 | 35.25 |
| SW | 52 | 56 | 65.5 | 64.5 | 35.25 | 35.25 |
| LW | 61 | 60 | 65.5 | 64.5 | 35 | 35 |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- ISI
- i3 O-Size
What the differences mean
At the 7-iron, the ISI is 34.5° and the i3 O-Size is 34.5°, identical at the club most golfers compare on, although other clubs in the sets differ. Across the 11 clubs both sets share, the i3 O-Size averages 0.5° weaker, with the largest gap at the SW (52° vs 56°). Beyond loft, the i3 O-Size 7-iron sits 1° flatter (63.5° vs 62.5°), which nudges start direction slightly right for a right-hander.
Both are game improvement irons, built for roughly 10 to 25 handicaps. Perimeter-weighted cavity backs with wider soles, more offset and stronger lofts, aimed at mid handicaps. Because they target the same golfer, the decision comes down to the specific loft, feel and shaping differences rather than who the sets are made for.
Both heads are listed as investment cast. With the build method this similar, differences in feel come down to head size, sole width, topline and offset rather than how the heads are made.
The i3 O-Size arrived 3 years after the ISI, a typical one-generation refresh. Changes over that span are usually incremental: refined face thickness, revised weighting, updated looks and small loft tweaks rather than a new concept.
Which should you choose?
The i3 O-Size is the weaker-lofted set — up to 4° weaker than the ISI. That trades raw distance for a steeper landing angle and more predictable stopping power into greens.
Both charts are reproduced in full on their own pages: Ping ISI specs and Ping i3 O-Size specs.
Frequently asked questions
Is the Ping ISI stronger lofted than the i3 O-Size?
Not at the 7-iron, where both are 34.5°. Other clubs in the sets differ, so compare the full table above.
What is the loft difference between the Ping ISI and i3 O-Size?
At the 7-iron the difference is 0° (34.5° vs 34.5°). The largest gap on a shared club is 4° at the SW, and 3 of the 11 shared clubs differ.
Are the Ping ISI and i3 O-Size aimed at the same golfer?
Yes. Both are game improvement irons, built for roughly 10 to 25 handicaps. Choose on feel, looks and gapping, ideally after hitting both.
Do the Ping ISI and i3 O-Size have the same lie and length?
Not exactly. At the 7-iron the Ping ISI is 63.5° lie and 36.75 inches, the i3 O-Size 62.5° and 36.75 inches. Both can be bent or built to your own fit.
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