Does biking in large groups, like the monthly ride called Critical Mass, help or hurt cyclists and the cycling movement? We debate the issue and get some tips for riding in the city on Chicago Tonight at 7:00 pm.

Chicago Critical Mass bike rides start from Daley Plaza, at Washington and Dearborn in the Loop, at 5:30 pm on the last Friday of each month, regardless of season or weather. The next ride will be held on Friday, Sept. 30. Watch the August ride in the video below.

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