It is part of an effort to help commuters integrate bike riding with public transit.
A grant from the Regional Transpiration Authority financed the systems.
Transportation officials presented the racks for the first time at the 95th Street Red Line stop Thursday afternoon.
"The goal of this project is to improve the ability of people to integrate walking and biking with their trips," said Chicago Department of Transportation Commissioner Gabe Klein. "Obviously, everybody who takes transit is walking, but a lot of people want to bike as well."
MORE INFO: New bike rack locations