Originally Posted by
jeff3069
I ride this bike since Jan 2006 with road shifters and a rear XTR and it works well.
in the new components, this is not going to work, that is known. This is why I am trying to learn how to do it right
Yes you may have because 9 speed the pull ratios were the same and didn't change till 10 speed which they diverged and continued that trend because why not.
GRX would be your better bet for using STI levers with wider range cassettes or move to
Gevenalle GX levers (assuming mechanical short pull braking) and then you can use an XT or XTR derailleur.