This is a 1996 Trek 2120 ZX in Ice Forest Green Metallic with Silver decals. It is a 20″ / 50cm / Medium (center of bottom bracket to top of seat tube) Composite Frame with Carbon Fiber Main Tubes joined with aluminum lugs and Aluminum Stays with an Aluminum fork. The stand over height is 29.5″ directly in front of the saddle.
There are 24 speeds available through the Shimano 105 three ring (52/42/30t) alloy chainset with 170mm alloy crank arms and the Shimano 8 (13-26t) gear freehub.
The rear derailleur is a Shimano 105 and the front is a Shimano RX 100. Shifting is through Shimano 105 Total Integration Brake Shifters (Brifters).
Both wheels are double wall Aurora alloy rims drilled for a Presta valves laced to quick release Shimano 105 alloy 32 hole hubs. Both wheels have brand new 700x25c blackwall tires.
Braking is handled by Shimano front and rear 105 dual pivot calipers.
The black vinyl Vetta Gel Flex saddle is mounted to an alloy seat post that moves freely in the seat tube.
Alloy handlebars are mounted to a TIG welded stem. The stem is not frozen in the steering tube.
There is a bottle cage on the seat tube and bosses for another on the down tube.
The bicycle rides, turns, stops and shifts through all of the gears and rings as it should.
I bought this bicycle from the original owner. Butted carbon fiber main tubes are mated to aluminum stays and an aluminum fork to give a claimed weight of 22.75 lbs. The full Shimano 105 groupset provides a set of very nice components. The made in the USA carbon fiber has a very striking pattern and goes very well with the dark metallic green of the rest of the frame.
For less than the price of a generic Bike Shaped Object that anyone might buy online or from a store that sells bicycles in the Toy Department, you could be riding this vintage bicycle with quality components. The fact that it is still rolling down the road is a testament to how well it was built.