Pneumatic spring adjuster for YSS struts of the 456'er series. The pneumatic spring preloader is mainly used in the racing sector, since it is important to be able to change the setting of the shock absorber as quickly as possible. The usual field of application are struts with a length of 280-320mm. Included in delivery is a threaded clamping ring which secures the adjuster upwards and is clamped against a cone. To operate the spring preloader, the pressure vessel is necessary.