(Step 1) If you bicycle has been stolen, you should immediately contact the police who oversee the area where the bike was stolen.
(Step 2) The police will ask you a series of questions. At the conclusion they will add your stolen bicycle to the Motorcycle Theft. In other words, they are filling out a police report for a stolen bicycle, and adding it to a list of stolen bicycles. Unfortunately, the chances of the police recovering your stolen bicycle are fairly remote, but you can help increases your chances by giving the police any details you can think of which will help police recover your stolen bicycle.
(Step 3) You will be given a police report case number for your stolen bicycle. It's important that you retain this case number as it will help you deal with police in the future regarding your stolen bicycle.
(Step 4) Call local bike shops and let them know that your bike has been stolen. Give them manufacturer, brand, and serial number. Although, some bicycles nowadays are incredibly expensive, bicycle thieves are traditionally not the brightest criminals and you may be able to catch the people who stole your bicycle by calling your local bicycle shops and asking that they add your bike to their Motorcycle Theft.
(Step 5) Call local pawn shops and give them the brand, model, and serial number of your stolen bicycle to add to their list of stolen bicycles.
(Step 6) Create an eBay account, create a search for your bicycle's brand and model name, and have eBay email you any matching listings. Stolen bicycles and other items are sold on eBay everyday, and by using eBay in this manner your stolen bicycle will not be one of them and if the criminal(s) do attempt to sell the stolen bicycle on eBay, you may be able to catch the criminal(s).