I am not concerned about the effect of this change on folding the bike. My routine does not require me to fold the bike and I bought it for other reasons (e.g., low step-over, short LOA, small wheels, low carrier rack height).

I am, however, a little nervous about spreading the fork from 74 to 100mm. 10 or 15mm seems doable, but 26mm sees like a stretch, to use an expression .... The Dahon fork looks lightly built. I'm sure that it's strong and would probably hold up, but a lot is at stake ....

The other consideration is the resulting profile of the fork blades and how they will relate to the shape of the Nexus or Nexave hub (I have both models of hub available to me) and the attached roller brake. Hub brake wheels don't fit into every fork or frame, and much depends on dropout shape and the angle of the fork blades or chain/seat stays. I'm not saying that it won't work, but I'd want to take some measurements and make some scale drawings before getting out the crowbar ...

Are you aware of Bike Forum members or others who have spread Dahon forks to 100mm?

Thanks.