I'm a big fan of urban biking, having had the privilege of living in Amsterdam and Paris which are both very bike friendly cities for daily commuting. Returning back to NYC, I got a cast off commuter bike from a neighbour, that after considerable work, I got in working order. Given drivers in NYC are nowhere near as aware of cyclists as European drivers, lights are essential. I fitted the crappy old "Fairway Flyer" with a Dutch magneto (aka "dynamo" although that term is strictly incorrect) generator and 6VAC old school chrome light. In practice, the drag on wheel isn't enough to notice given the entire bike is hardly built for speed.