I found a really sweet city bike at the MOMA store this week made by this company exclusively for them, but it was sold out online, so I went looking at the source. BIKEID is an elegant stripped down bike outfit based in Stockholm that gets that urban NYC thing crossed with Euro bike culture just right. Their track model is ChroMo, fully customizable and comes with a very cool rear gear/brake system: "Track sports two gears and a coaster brake. The gears are built into the hub and shifts automatically at 18 km/h. The bike comes in two sizes, 56cm and 59cm (Bullet Grey and Chrome only). The larger frame is best suited for people 185cm or taller. The total weight is only 11,2kg."