Any bike groups in the South/Southwest Suburbs?

I'm in Romeoville.  Personally, I mostly ride alone.  However, I do make trips up to St. Charles for road rides and to Palos Woods on the MTB.  During the week I do a ride along the frontage roads on I55 and the industrial parks in Boilingbrook.  If I ride here on the weekends I'll extend that onto the I&M trail north to Willow Springs for 75 miles.  Other than the ones menetioned already, Downers Grove has a club and American Bicycle has a club as well. 

I ride a lot of the same roads as you do (Frontage Loop, Internationale Pkwy,).  Since you're from Romeoville, I'm sure you've ridden the Centennial Trail...which runs along the south side of the Des Plaines (opposite of I&M Canal Trail).  I love the new extension they just paved last year, extending the path all the way from the Willow Springs entrance to 135th St...just about 12 miles one way, so makes for a nice 25 mile out and back ride.   There is some nice riding in the Burr Ridge area, too...just north of the trail's Willow Springs entrance.  German Church Road and 79th Street are both awesome riding roads...with some nice hills.   As are Madison Street and 91st Street.   We also like riding the stretch of Archer Ave, just south of the trails and over the bridge...we usually ride it west to where it intersects with Rt. 83, but then we make a left turn (illegal, but we obviously look out for traffic) on to 107th Ave and head back east to 104th Ave and take that north back to Archer.  Best to do that one really early on a Sunday morning, when traffic is low...because there is very little shoulder to ride on.