This week, Puma launched its new line of ultrasharp city bicycles designed by my dear Danish friend Jens-Martin Skibsted, his firm Biomega, makers of high-design luxury bikes, and Kibisi. Above left is the Pico, a BMX-inspired frame that folds up; right, the Disko, which has a tension wire “down tube” that doubles as a bike lock. Puma Bikes