Can a frame designed to take an ahead headset take a quill.

Captain Vimes

Retro Guru
The head tube is 120mm. Anyone know where I can look up what the steerer length needs to be and how much of that needs to be threaded? I have Googled, but struggling....
Ha! Think I have found it now, but wouldn’t mind some confirmation.

Head tube length, plus upper stack height, plus lower stack height, minus 2mm.

Sound right?


Senior Retro Guru
I always worked on head tube plus 40mm is the length of the fork column. That then accommodates a high stack headset. If you then use a low stack HS add washers.
I would add don't work to a low stack HS. If you then want a different make with a higher stack you're kinda stuck

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