Last weekend I found great UT (Texas Longhorns) bar called the Brownstone Tavern, there, but could not locate a Niners bar for the NFL game.
I did find out about these places though. They are bars for divisional rivals (of the Bears), so they may be fun places to watch the game as they'll surely be rooting for the Niners this week.
2249 N. Lincoln Ave. Chicago, Il 60614
A great place for Detroit fans to unite and watch the game. Great specials throughout the week!
Green Bay Packers
Will's Northwoods Inn
3030 N Racine, Chicago, IL 60657
"You can tell where we are by the Packers flag out front. So put on your green sweater and cap, come on in and have a Will's Wisconsin-style Bloody Mary (served with a pickle rather than celery or some other fou-fou concoction) along with a Sneaky Pete chaser of Leinenkugel beer, graze on our free food and watch the Packers win!!"
3358 N Sheffield Ave. Chicago, IL 60657
"Hey Minnesota fans - Redmond's is your home for all Vikings football this fall! We always play the sound for the Vikings games, and we have a ton of flat screen TVs."