DeKalb and Sycamore have a number of bike trails that connect the parks and towns. The DeKalb County Forest Preserve has bike and hiking trail maps on their website and you can reach them here.
Ride Illinois has produced maps with suggested bike routes and paths for several cities throughout the state. The organization has also collaborated with the Illinois Department of Transportation on their maps, which are best for rural areas here.
If you’re a road rider looking for a basic map of the county, click here. Road routes are easy around here – we’re blessed with miles and miles of open road.
IL Dept of Transportation has a page directed toward the recreation in Illinois and provides maps and information state wide for riders and pedestrians for trail, path and street-ways. Click here for that information.
If you’re looking for off-road mountain biking trails, you’ll need to hop in the car for a bit. The closest trail systems are at Rock Cut, Saw Wee Kee, Palos, and Veteran’s Acres. Kettle Moraine in WI is the best riding within a couple hours.