]CX - CycloCross. Variously described as like hitting yourself over the head with a piece of 4x2 - only enjoyable once you stop, or a great place to hook up with forumers with a beverage and yell (encouraging words?) at people riding by on things that look like road bikes through mud and over hurdles. Can also refer to the bike, which is like a beefier road bike, with greater clearance for bigger tyres, and generally either caliper or now disc brakes.
I think this should be cantilever brakes.