Originally Posted by
Velognome
Brought this up to my frame building friend today, he said, " of course the dimensions are different after assembly, they've been cut according to the builds layout". So are you measuring unused fork blades or fork blades already built up?
actually I am not measuring anything myself, just reporting the published dimensions from various sources.
I'm sure there could be slight changes in the dimension if a blade is greatly cut down (into the area where it tapers) but from what I see the typical blade has a large enough untapered top end such that a range of forks could be cut (from say a 27" to a 650C) and still have the same dimensions at the tops.
I'm also sure that a blade top can be "massaged" a little to fit a given fork crown...probably was done all the time.
The Haden catalog blurb says that the crown opening of theirs for the NCO Reynolds (27.5 x 20) is also "suitable for other similar blades from other manufacturers" which has to mean that a Columbus (28 x 19) can be made to fit in that oval hole...just squish the end a little.