Disc singlespeed w/ eccentric.
This frame made it through the 24hours in the old pueblo, was totally unharmed in a crash that bent my fork so bad I had to spin it backward to clear the frame. Also did the last 24hours of snowshoe. This bike handles so good I was passing geared bikes on the climbs and full-boingers on the downhills. i’ve had it all, custom steel is where it is at..