YSS shock absorber MZ456-390HRL-13-88 for BMW R 19 21-22. The YSS suspension MZ456 series is a Nitro gas supported shock absorber. The offered shock is specifically developed for your motorcycle model. Hydraulically adjustable with a knob on spring-preload, rebound adjustable and length +-5mm. The shocks are approved on safety and use by the German T�V KBA ABE. YSS offers a 2 year full factory warranty. This shock absorber is fully serviceable.