I have a set of STi irons and a set of TS2.  They are identical builds.  Same shafts, grips, length, and lie.  I hit them both in the middle of the faces.  The STi go very straight.  The TS2 start left and move left.  I think I’ve ruled out every possibility except that the TS2 must be closing faster than I’m used to because of lower MOI.  How likely is this?

Britt Lindsey Answered question July 13, 2022