You're right: it's just the fork that prevents it. But a skinny tire up front is ok with me, and although a fender would be nice, I've gotten away without it so far. Maybe I'll change my mind at some point. ;)
I like the Vittoria Randonneurs suggestion! Thanks!
--- In email@example.com, David Backeberg <dbackeberg@...> wrote:
> You do not say what is preventing a fatter tire in the front, but you
> can probably fix it by changing the front fork to a fork that supports
> cantilever / v-brakes. Such forks usually also have wide tire
> clearance. You could totally go the used route for this, and maybe go
> digging at the local bike shop or bike coop if such a thing exists in
> your area.
> If you can only fit a 25c tire, you probably also cannot fit a fender;
> you could probably get a fender if you change your fork. The wider
> tire you can fit, the nicer your ride is going to be over bumps / when
> carrying cargo.