Specialized Fatboy 20" The Specialized Fatboy 20 is the fat bike fun machine for kids. It features a lightweight frame-fork combination and 4.0-inch wide Ground Control tires, making the first adventures off-road a breeze. The following modifications have been made: - Smaller chainring on the crankset - Hydraulic disc brakes with adjustable lever reach (to accommodate small hands) - Reflective rim tape If interested, a hydraulic dropper post (operated under the saddle) can be included. The bike has not been used often and is in well-maintained, very good condition.