single speed cyclocross

New Cinelli / Mash steel track frame. 

Same great Mash influenced Cinelli build, Columbus tubing. 


This frame set has removable cant brake studs, and can be built several ways. Single Speed Cyclocross, Track, Work, and Criterium.

Available in 5 sizes: 50, 53, 55, 57, and 60

Includes the frame, fork, sealed headset, seat collar, and brake studs.

27.2 Seat Post

English/68 Bottom Bracket

1 1/8th Threadless Headset

100/120 hub spacing.

We are pleased to share a special project we have been working on with Chas Christiansen and the team at Columbus/Cinelli. Enclosed are some details of our first Columbus steel frame set. This unique platform is intended to solve for a broad range of needs with one bike. Chas travels heavily—racing alley cats, working as a messenger, racing cyclocross—so this bike was born from those diverse needs. The geo has a high bottom bracket and is aggressive in nature, but allows for weight to be carried on the front rack while feeling stable. The frame and fork have removable canti brake studs, so the bike can be ridden as a clean fixed gear, or single speed cyclocross frame set including internal cable routing for the rear brake. Both the frame and fork will clear 35c tires for dirt, or a smooth street tire. We kept a raw look that preserves the weld heat markings by adding a clear coat to the steel. This treatment celebrates Columbus, whom we are proud to call family. Garrett Chow drew on the historical Cinelli and Columbus art archive to detail this frame set in a timeless manner.

I’m selling my All City Nature Boy in hopes of funding a geared cyclocross purchase.  Frameset was bought new last year and has been ridden less than 200 miles.  Complete bike is in amazing shape.  Shipping within U.S. preferred but would be willing to ship overseas at buyer’s expense.  Please see the ebay listing here for more details.