Head Tube / Stem strength question
Hello - I'm a new framebuilder and have a headtube question!
I have a 250lb client who rides a lot and uses a front rack to carry up to 50lbs. I'll be building a steel lugged frame and front rack. He wants 1" headtube to use with a quill stem. Because of the geometry of the frame, and client's desire to easily change riding position, this (NITTO) quill stem may extend upward quite a bit, say 90mm, but never past the limit. It'll probably be a 110mm reach stem. I am concerned about the flex in the stem (and possibly with the 1" HT).
Anyone have comments regarding if this may be too flexy? If so, any suggestions to remedy would be greatly appreciated!