Cycle Visions 49mm Fork Tube Extension For Harley The Cycle Visions 1 Fork Tube Extensions are constructed from Stainless Steel. Features: Made from stainless steel Fork Tube Extensions are perfect when installing 23 and 26 front wheels, or to raise the bike up 1 Extends all 49 mm fork tubes FL models require 1 longer fork slider covers (sold separately) Note: Will not work with air assist or cartridge-style fork tubes.