Bicycle Front Derailleur Clamp Adapter 34.9mm Front Derailleur Braze Adapter Converter Clamp Aluminum Alloy for Front Derailleur. Versatile Conversion: Perfect for cyclists looking to upgrade their ride, our bike hanging front derailleur braze-on convertor adapts seamlessly, making it possible to transform a direct-mount front derailleur into one compatible with a band-on design, expanding compatibility and enhancing performance.