Fox Factory Qs3-R QS3 Shocks For Harley Dyna FOX's Qs3-R compression and rebound adjustable design, combined with vehicle specific damping and linear spring rates, gives you the ability to quickly adapt to any riding situation. With an external reservoir housing an internal floating piston to separate the nitrogen gas from the shock oil, the Qs3-R shocks will maintain damping control no matter how long you ride. The quick switch compression adjustment on the reservoir allows you to select between three distinct settings: solo rider, solo rider and gear, or two riders and gear. In addition, the QS3-R's wide range rebound control has 12 distinct clicks, allowing you to tune the exact rebound rate to balance out your spring preload and keep your rear wheel firmly planted on the road. Features: Hand adjustable preload, wide range rebound and low speed compression Qsr: 3-position quick switch rebound adjustment Qs3: 3-position quick switch compression adjustment Aluminum piggyback reservoir Gas-charged mono-tube with internal floating piston (Ifp) Advanced high-flow, deflective disc velocity-sensitive damping 1-1/2 6061-T6 aluminum type III hard anodized body Fully rebuildable and revalveable 5/8 low friction, super-finished hard chrome shaft