Fubi Fixie has a patented frame technology that utilizes the triangular principle in order to have a very rigid and light frame. The frame is built by using the 4130 chrome molybdenum steel tubing. The folding system allows you to secure the bicycle in a more secure way. It can be locked around a pillar with front wheels, frame and pillar all locked together with a U-lock. Fubi Fixie fits folded in elevators, metro, bus and in most cars.