Ecobici is the public bike service of Mexico City, it is available for certain neighborhoods including Juárez, Cuauhtémoc, Centro Histórico, Condesa, Roma, Narvarte and San Pedro de los Pinos. You can pay for a temporary membership; 1 day will cost $90 mxn, 3 days: $180 mxn, 7 days: $300 mxn. You will have to submit an online form and pick up your card at the Customer Service Offices as soon as you are in the city. The service is amazingly useful especially around this area, though not every street has a bike lane. You can only use the bike for 45 minutes so make sure to drop it and pick another one after 5 minutes if you need some extra time, Ecobici will charge an extra fee otherwise.