Par4QC In the 15 years I've been buying components from Integra, one thing I've learned is to take all their specs with a grain of salt. They make some decent compoments, especially the stuff that they make for other brands (such as DiamondTour). But their published specs for any of their stuff is far from accurate or consistent. Maybe those are the numbers they provided DT when they started making the shafts for them, maybe DT messed up entering them in the system, maybe they intentionally fudged the numbers a little (while still keeping them within tolerances) just so they don't look exactly like the iDrive on paper. Who knows. All I know for sure is it's the same shaft. This is coming from Integra who makes it for them, not just a hunch of mine.