"Fat Tire adapter kit for Softail 1986-1990. When you want to go wide without changing your rear drive system, this kit moves essential components and provides appropriate spacers to allow installation of that fat rear tire. Adapter kit allows installation of up to a 150/160 series tire depending on the installed tire width. These kits move the transmission, primary and drive sprocket/pulley to the left 1/4"". Be sure to check all clearances when installing wider tires."