Blue threadlocker is suitable and I have it on my personal bike. It is not required and we have not noted any incidence of derailleur hanger bolts coming lose. 7nm is adequate torque for the hanger bolt.
Steve The Intern Answered question
Blue threadlocker is suitable and I have it on my personal bike. It is not required and we have not noted any incidence of derailleur hanger bolts coming lose. 7nm is adequate torque for the hanger bolt.