Originally Posted by
unterhausen
it originally came with a 700c fork, so that's probably what you want. The measurement you want to replicate is the axle-crown (AC), preferably of the original fork.
You may not have the longest reach brake, I'm pretty sure these came with the mid-reach version. Could be wrong, of course.
The original fork had eyelets. I don't know if you can get one of those though.
I'm moving this from framebuilders to C&V so you can get better help.
I don't think there's a need to replicate the axle-crown measurement if you understand that the head tube angle will change slightly, which will affect trail, but you'd only notice it if it were significant.
That said, I prefer very long AC measurements, as this gives more room for fatter tires and fenders. Soa shorter AC measurement than your original fork might be an issue. If you're trying to use the original brakes, that's another consideration.