The FOX QS3-QSR rear shocks feature three-position compression and rebound switches for easy adjustments. The Quick Switch compression (QS3) three-position adjustments on the piggyback reservoirs allow you to select between three specific settings: maximum comfort, extra support during hard acceleration, or most responsive and precise handling. The Quick Switch rebound (QSR) settings make it easy to dial in the correct rebound for different riding situations: comfort on bumpy backroads, any road balance of control and comfort, and a glued to the asphalt feeling on smooth twisty roads. Combine with the new FOX GRIP Street Performance Fork Cartridge Kit for Harley Dyna to achieve ultimate comfort and control.