SRAM

Rear Derailleur Outer Plate Half Mount - For Use with RD-S100

SRAM Rear Derailleur Outer Plate Half Mount - For Use with RD-S100 is an optional reinforcement plate designed to improve real-world durability on modern MTB and eMTB builds. By integrating with the UDH bolt, this Half Mount outer plate adds a more robust interface intended to better resist the side impacts, knocks, and trail-side slams that can happen in a tip-over or transport mishap.

Built specifically for SRAM S100 Eagle rear derailleurs, it’s a targeted upgrade for riders running heavier systems (including eMTBs) where a simple fall can put more leverage into the derailleur/hanger area. Compatible only with frames that use the Hangerless Interface required for UDH (Universal Derailleur Hanger).

• UDH bolt integration - Helps add robustness at the derailleur mount interface for better protection in side impacts
• Purpose-built for S100 Eagle - Correct fit for SRAM S100 Eagle rear derailleurs only (RD-S100)
• MTB and eMTB security - Useful where higher bike/system weight can increase the chance of damage in a basic fall
• Hangerless Interface required - For frames designed around UDH compatibility
• UDH sold separately - Requires the UDH and the Half Mount-specific S100 Eagle rear derailleur mount bolt (sold separately)