FSA Front Derailleur Adapter for Super Compact cranks for 48/32 46/30 Chainrings. The FSA Front Derailleur Adapter provides a secure and adjustable mounting solution for front derailleurs on frames with non-standard seat tube diameters. Designed for compatibility with a variety of road and gravel bikes it ensures precise shifting alignment and easy installation. This adapter is a practical component for custom builds or drivetrain upgrades.