Bicycles are not allowed in Millennium Park. All wheeled vehicles must be walked not ridden on park grounds.
But the McDonald’s Cycle Center in Millennium Park is a state of the art facility dedicated to promoting the use of bicycles for commuting to and from Chicago’s Loop and Millennium Park in an effort to reduce traffic and pollution in the city. The Cycle Center offers bicycle rentals, bike tours and Segway Tours, plus lockers, showers, bike repair, and other amenities designed to encourage biking downtown.
Check out their website to learn more Bikechicago.com