Bicycle detail

Hello everybody, I'm Roni, I just discovered this app. I got my bike stolen. It was a Black Trek Fx1, 700c rings, 20" frame bike. Bike was stolen at Douglas Park in Chicago Illinois on Sunday night July 17th. Went to the festival at the park and left the bike locked to a fence next to the main entrance at Sacramento driveway. When I came back, bike was gone. There were like 4 cops around, I asked a couple of them and no one saw anything. It was 4 digits combination lock, so I assume they cut it with something. Unique features are: Front ring is black, back ring is silver, it has a front Presta valve and the back would have the Schrader . Please, if you see this bike contact me, any information would be appreciated. I'm offering a 50$ reward. Thanks.