grant40

I really enjoy it.

Polaris OBark

I really like the idea of this, but worry that I would wind up pushing the bike up steep hills. My lowest gear is 30T X 36T (F/R) and I find I use it a lot, especially off-road.

Has that thing got a coaster brake?

mstateglfr 

FG? No- I haven't found it to be appealing.
SS? Did a few rides a couple couple ago while I transitioned my old gravel frame into a commuter. It was fine, I just rode slower than normal.

chas58

I made one. Haven't ridden it much, as its too hilly around here. Maybe I'll try it at a CX race, as for the most part I never shift at a race.

I've spent years doing fixed - not sure I'd do that at a CX race. We do have a CX race that covers 3/4 of a lap at an old velodrome though. ;-)

t2p

with almost 13K elevation gain - I don't believe a single speed gravel bike would be ideal

https://whiskeyrebelliongravel.com

Koyote

I've only done the Whiskey Rebellion in its first year, when it was shorter -- and don't recall seeing any SS or FG riders. But I have seen SS riders in some other very challenging (and hilly) races in that part of the country.

grant40

My other one.

msu2001la

Lots of single speed CX racers in my area. Our local series has a few different single speed categories and also allows people to jump in on geared bikes that have the shifter zip-tied to prevent shifting. Brakes are required.

I've debated building my old CX bike into a SS racer just for this purpose, but it's become my winter trainer bike and I like having gears for that.

Even if a series allowed them, CX racing on a fixed gear/no brakes seems like it would be really difficult, especially dismounting for barriers/run-ups, and also dealing with steep off-cambers where pedal strikes would be a problem, etc. It would be fun to mess around with though.

Floyd Feldspar

Ride on gravel and rail to trail. Still trying to figure out timing for hops on single track.

tFUnK

Really fun but unless you have a course that you can do regularly it's a bit niche.

Dylansbob 

Tracklocross/FG singletrack rigs

thehammerdog

Love the SS world. Got 30mm knobby tires bike is confy but heavy. Frame crap high tensil steel . But fits well.

pbass

Not fixed, but I ride my SS Cross Check - drop bar, currently 34x18, Nano 40s - quite a bit on singletrack and fire roads. In fact, it sees very little pavement. I use my geared gravel bike more often simply because it's so steep around here, but man, every time I come back from shredding on the SS, I am always very stoked. I love it.
Funny thing, the other day I was riding it on a trail that's usually frequented by MTB's, w rock gardens, etc. I had stopped to chill, and a guy on a full squish MTB pulled up, looked at my rig and said "Why?". Cracked me up.

mihlbach

I barely ever ride a mountain bike anymore, opting for these instead. The tracklocross is always fixed, while the cyclocross alternates between SS and fixed. I ride these mostly on local mountain bike trails, fire roads, and other trails, which aren't flat, but don't have long extended climbs either. I have also done some extended bikepacking trips on the cyclocross (in SS mode) that involved quite a bike of climbing, but generally I do that kind of riding with gears.
Most of my local trails have what I would consider to be "minor" technical features, that (for a former BMXer) are extremely boring on a MTB, but much more interesting on either of these, particularly the brakeless/fixed tracklocross. My offroad fixed ratio is 43:18 which I find to be low enough to easily skid but also allows me a degree of controlled braking modulation that I would say is roughly equivalent to running a coaster brake, which I also do at times.