This new YZF link has been redesigned for track use targeting the 2018-2023 YZ450F & YZ250F chassis. In performance mode it provides a better balance point similar to a 2mm spacer but with other advantages like improved handling, straight line tracking and a more planted feel in breaking bumps. A byproduct of this link is that it lowers the back of the motorcycle 6mm. By flipping the insert 180 degrees to lowering mode, the seat height is 22mm lower than stock, ideal for trail riding or for smaller less experienced riders. NOTE: This setting is NOT recommended for aggressive track use, the shock will bottom out much easier due to the added leverage produced by this longer center to center distance. This adjustable link comes complete with bearings, seals and the steel roller bushing. Recommended sag with the Rideng Link is 102-106mm for 2009-2017 and 100-104mm for 2018-2023 models (100mm 2023 YZ450F).