5 boro fix
This is the bike I took to New York -- a Fuji hybrid frame turned fixed tourer. 
Literally the only thing remaining stock is the frame, fork, and bearings. 42x16 and light as a feather -- for steel.
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Passaic river bike
Bike in the woods: A fixed Centurion I used for quite a few years, this thing rode fine on mellow trails by the river with knobby tires and a low gear.
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Lonerider on old Puch roadbike
[old picture -- taken back in the mid 1990's. I wish I still had the bike! It was my first bike with presta valves...]