I'm a member of both sites (I have the same user name) and they are both good in their own respects. CLSB is more for mature riders/NESBA racers. chicagoriders started cause of the young guys doing wheelies and tricks during group rides and then they got kicked off CLSB. So they started chicagoriders. Chicago riders has a bikenite every Tuesday at Michael Anthonys pizza parlor in down town Villa Park. CLSB has a bike nite every wednesday at Strats drive in on North Ave in Villa Park.