If you own a braze-on front derailleur then purchase a frameset that requires a clamp-on front derailleur, this is what you need so you can keep using the derailleur you already own. It transforms a braze-on derailleur into a 28.6mm clamp-on style in a matter of moments. Designed with carbon frames in mind. Wider band clamping spreads clamp area pressure on the seat tube. These clamps are completly compatible with both Shimano, Sram, Truvativ, and Campagnolo front derailleurs.