Bicycles are covered under the personal property section of standard homeowners and renters insurance policies. This coverage will reimburse you, minus your deductible, if your bike is stolen or damaged in a fire, hurricane or other disaster listed in your policy.
If you are purchasing a new bike, keep the receipt and call your insurance agent or company representative immediately. If you own a particularly expensive bicycle, you may want to consider getting an endorsement that will provide additional coverage. Your insurance agent or company representative can review your coverage options with you.