CRF450R/CRF250R XTRIG ROCS Shock Preload AdjusterXTRIG ROCS Shock Preload Adjuster Makes changing the rear shock absorber spring preload settings very quick and easy and replaces both preload rings on your shock Preload rings are replaced by a mechanical device that uses the shock bodys threads to move an adjuster up and down Preload adjuster makes race sag adjustments quickly and easily Mechanical transmission Use the complete thread of the shock absorber Low weight Not affected by dirt Fitment