NADAguides.com has listings for used motorcycles. The website provides pictures, prices, specifications and manufacturers for motorcycles and dirt bikes. There is also a comparison feature for motorcycles with different specifications.
NADA.com is the official site of the National Automobile Dealers Association, and they have the most comprehensive database of used and new vehicles for the consumer or business to peruse. NADA offers selling and buying resources to help users capitalize on their vehicles' worth and offers resources such as vehicle history if the VIN is supplied. It also allows local searches for vehicles and is partnered with GEICO for insurance quotes, as of 2015.