I'm considering an upgrade of my kona paddywagon to front disc brake. In order to do so, I'll need to replace my stock Kona Retro Road fork to something like THIS
My main concern is that stock fork has 375mm axle to crown when cyclocross one is 398.
Rake is 43mm and 45mm accordingly.
Would it change my frame geometry significantly? Also, any critique of the project idea or other ways to implement it would be appreciated.