HardDrive R0800132-1 12" 705 Series Rear Shock Preload adjustable stable HardDrive 705 Series rear shocks with RacingBros' race proven SAV, "Speed Adaptive Valving" damping system provides superior ride quality regardless of road conditions Easy set up spring preload cap Heavy duty spring rate recommended for riders over 200 lbs or frequent 2-up riding Rebound adjustable version Available