I bought a frame, unfortunately the frame did not come with the original fork. The previous owner said the fork had hairline fracture at the steerer-tube, so he throw it out. I have asked the previous owner and he had no clue about rake.
At this moment I am trying to work out the rake of this fork, so I can start restoring the frame to original looks/geometry. Hoping someone can help me...here is the photo:
I know this might be a very hard job.
Thanks in Adv,
PS: I posted the same thread in the Bike Mech section, and realised this section is more appropriate.
Get flat block of something like aluminum, or wood, or even a book that seems to be flat, that is 1-1.5" thick. Put that on another flat surface, like a flat table. Lay and hold the steerer tube on the first flat part so the the crown and blades are sticking off, suspended above the table, dropouts up. Try to make sure its level and measure from the table to the dropout. Then subtract half the diamiter of the steerer tube and the block thickness.