Öhlins HD765 Blackline - DYNAFITS 1991 2017 DYNA FXD The hlins STX36 Blackline is a classic monotube design, featuring quality that delivers the performance you need for your Dyna. The STX36 line of suspension is one of the most successful designs of all time. This divided piston type shock features rebound adjustment, length adjustment and easy to use pin tool preload adjustment with multiple spring rate options to fine tune your ride. Adjustable Rebound Damping Monotube Shock