The Eagle S100 Half Mount Plate is a simple but smart addition for riders who want extra peace of mind on the trail. By integrating with the UDH bolt, it provides a secondary point of support for your derailleur, adding resilience against the side impacts, knocks, and slams that can knock a standard hanger out of alignment. Even the smallest bend can compromise shift quality and accelerate wear. The Half Mount Plate helps keep everything straight, true, and shifting perfectly, ride after ride. This security is particularly valuable on E-MTB's where the added weight of the system can cause extra damage in a simple fall The Half Mount plate integrates with the UDH bolt and the Half Mount-specific Eagle S100 rear derailleur mount bolt Only compatible with frames that feature the Hangerless Interface required for UDH.