The SRAM Red Braze-on Front Derailleur Adapter for 34.9 mm is a precision clamp-on accessory that lets you mount a braze-on-style front derailleur to frames without a dedicated braze-on tab. Designed for riders upgrading drivetrains, swapping derailleur standards, or fitting SRAM Red front derailleurs to older or oversized seat tubes, this adapter provides a secure, aligned interface that preserves crisp, reliable shifting performance.

Constructed from machined alloy for strength and lightweight performance, the adapter clamps around a 34.9 mm seat tube or downtube and provides the correct attachment point for SRAM’s Red braze-on front derailleur. Its design ensures the derailleur sits at the proper height and angle relative to the chainrings, which is critical for smooth, accurate shifts and minimizing rub across the gear range.

Installation is straightforward with common hex tools: position the adapter around the tube, tighten the clamp to the specified torque, and mount the front derailleur in its intended braze-on orientation. The secure fit helps prevent movement under load and maintains consistent geometry under pedaling forces. Whether you’re restoring a classic frame, re-gearing for performance, or aligning mixed standards, the SRAM Red Braze-on Front Derailleur Adapter 34.9 mm is a practical solution that keeps your shifting sharp and dependable.