are there further reasons for running rigid forks when single-speeding?
not really. At least no more than “just because”. just that the directness of a v light, ss build is kind of amplified with the feel of rigid forks. Even moreso if you they are torsionally stiff too – i.e. with a nice fat hub, or in my case with trusses.[/quote]
I’d say that the some of the usual ss riding style (like when you’re having to muscle the bike up a hill or over something techy) are more conducive to a rigid fork. It’s not an all or nothing thing, but combined with the “simplicity” thing they do seem to go together well. What he ^^ said about bobbing is important!
I was exclusively rigid for a long time, pretty much from when I started riding in 1986 through to succumbing to a proper full-suss about 5 years ago. There were short dallies with suspension in there, but nothing that lasted more than a couple of rides really. A big chunk of that was exclusively single speed too.
I’m now more evenly spread. Rigid singlespeeds, sus-fork singlespeed, full sus etc etc. Oddly the only bike I haven’t really been able to find a home for (and I’ve tried on at least 3 occasions) is a geared hardtail. It’s probably the flavours I’ve tried but they just haven’t clicked. Full sus and gears yes, rigid or sus and singlespeed yes, so far nothing else.
I think a racier fast hardtail, maybe a 29er, might find a home. But I don’t ride the bikes I’ve got enough as it is