Yes, the shaft weight affects both the swingweight and the club’s MOI. Although its influence is weaker than that of the clubhead weight, it should not be ignored in calculations.
As a rough guideline:
- For irons, a 20-gram change in shaft weight alters the swingweight by approximately 1 point.
- For drivers, a 13-gram change in shaft weight alters the swingweight by approximately 1 point.
For precise calculations, use the calculator available in the Swingweight Planning section.