Rizoma Front Sprocket ZBW030A - SilverRizoma Front Sprocket ZBW030A The main structure of the Rizoma sprocket cover is made from meticulously machined, anodized billet aluminum and fitted with a replaceable Delrin slider. A carefully designed, characterful element weighing little more than 0. 25 kg. Caution: ZBW030 is only compatible with models fitted with ABS. Technical information Caution: ZBW030 is only compatible with models fitted with ABS.