I have a lugged CX/all-rounder frame on the way, will be replacing the 1" threaded unicrown fork with a lugged one (also threaded, same length & rake, no probs) to match the lugged frame. Seller lists head tube as being 105mm. Fork comes in three different steerer tube lengths- 145mm, 165mm and 185mm. Each has a thread length of about 42mm. I'd like to get the 165 and use 2cm or so of spacers, but I'm not sure the threads go low enough on the steerer tube to allow the headset to be installed.
165mm (total steerer length) - 42mm (thereaded portion) = 123mm.
Head tube, again, is 105mm.
So, 123mm (unthreaded portion of steerer) - 105mm (head tube length) = 18mm
If I install a standard 1" threaded headset, say from Tange or Shimano or Campy (fork crown is 26.4) will I run out of thread before the upper cup secures the upper bearings?
Thanks so much to anyone who can provide even a little help.