Experience ultimate comfort and control with the FOX IFP-QSR rear shock. With an internal floating piston (IFP) to separate the nitrogen gas from the shock oil, this shock will maintain damping control no matter how long you ride. Three distinct rebound settings (QSR) 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 get the best possible ride quality with the ultimate in adjustability for comfort and control.