Originally Posted by BFBridgeguy
The single speed bikes in your photos are probably used by messengers.
Perhaps, and just as comical as if used by regular commuters. Track bikes and fixed gear bikes are still bicycle fish out of water in Center City Philadelphia (or any other city with nutty stop-and-go traffic and frequent wet conditions) despite their alleged "street cred" for simplicity. No brakes - what could be simpler - Maybe no seat?