Ohlins S36PRCL Rear Shocks For Harley Dyna Ohlin's PRCL line features an external Piggy back reservoir, Rebound adjustability, Compression damping adjustability and Length adjustability. Unlike standard gas over oil systems, Ohlins features a specially divided internal piston and piggyback which keeps the gas and oil separate. The piggyback also allows for much more oil to be used, enhancing cooling. This provides exceptionally consistent performance and avoids fade from use. The external Rebound adjuster allows you to tailor the shock to your preferences and customize the feel for each ride. Heading to the twisties? Give the adjuster a turn to the right which restricts some oil flow and gives an aggressive feel, great for performance. Need maximum comfort for the long haul? Twist it to the left to increase oil flow and provide a comfortably plush ride. For maximum tunability, these shocks also include an adjustable compression damping adjuster wheel. This allows the high level of precision tuning on the compression stroke, rather than just rebound like some shocks. Finally, the Length adjustability allows you to fine tune the height of the shock without effecting stroke. This lets you set the perfect geometry on your bike. Features: STX monotube high pressure gas shock absorber with external “piggy back” reservoir Adjustable rebound damping with adjuster wheel above the end eye Adjustable compression damping with adjuster wheel or slot on the reservoir Length adjustable + or - 1/2" Adjustable preload Hard anodized Nitrogen charged Precision CNC-machined components Low-friction piston rod Low-friction eyelets Serviceable and repairable 36mm piston diameter Includes preload adjuster tool Sold as a pair Spring Weights: Standard recommended for individual rider weighing 180lbs - 225lbs Heavy Duty recommended for individual rider weighing over 250lbs