If you have a Campagnolo Electronic Power Shift system, and need to run it on a frame designed for a clamp-on front derailleur, then you"ll want the EPS Front Derailleur Clamp. This clamp is designed to fit 34.9mm seat tubes; just bolt it to the EPS Front Derailleur braze-on style mount, and begin the adjustment for the assembly in Zero Settings Mode from the Interface. Product FeaturesMaterial: Speeds: Pull Type: Mount: 34.9mm clampCapacity: Compatible Components: Campagnolo EPS groupsetsRecommended Use: mounting your Campagnolo EPS front derailleurManufacturer Warranty: 3 year limited