Smooth Fork Boots For Fat Tire, BlackSmooth fork boots feature a sculpted CNC machined billet design with specially notched inside surfaces to allow the use of 18 x 5. 5 fat front wheels & fenders on FLT Touring models When paired with Arlen Ness fat front fender designs, 18 x 5. 5 fat front wheels can be installed without any fabrication. True direct bolt on design Designed to work with Arlen Ness and most aftermarket fat front fender designs CNC machined from billet aluminum '14 later