![]() ![]() With success: many manufacturers have since embraced the new interface and designed their frames (more precisely, dropouts) in such a way as to accommodate a UDH derailleur hanger. The open-source derailleur hanger was marketed as an easily replaceable and universal solution. Industry insiders and keen readers already knew what SRAM was up to when they presented the Universal Derailleur Hanger in 2019 – UDH for short. Fortunately, SRAM have been thinking about this for a long time and have taken all the necessary steps to realise this design. Unfortunately, you can’t just omit the derailleur hanger and attach the derailleur directly to your bike. The new SRAM Eagle Transmission is based on the UDH derailleur hanger Read on to find out how it works, what it means for your frame, and how it fared during the last 6 months in our long term review. Fortunately, SRAM have now tackled this issue – their new Eagle Transmission derailleur mounts directly to the thru-axle, no derailleur hanger or adjustments needed thanks to the Hangerless Interface. These problems also annoy the brands themselves because annoyed customers will come knocking at the doors of bike shops and service trucks and flood their inboxes with complaints. Never mind the fact that derailleur hangers can bend just from your bike tipping over, rendering the derailleur useless – annoying! At some point or other, most of us will have had to fiddle with the upper and lower stops or the B screw – responsible for the distance between the upper pulley and the cassette – because the rear derailleur wouldn’t perform as it should. This is the only way to ensure fast and reliable shifting. Because of the different derailleur hanger designs, the position between the rear derailleur and the cassette is specific to each bike model, and the derailleur must be adjusted accordingly. This is also the reason for the countless adjustment options of conventional rear derailleurs. In addition, there’s an extremely wide range of different derailleur hangers on the market, because almost every bike model uses its own design. ![]() However, the derailleur hanger continues to serve as an interface between the derailleur and the frame, and while it, too, has undergone further development, it increasingly struggles with the large gear range of modern derailleurs. The drivetrain and especially the rear derailleurs and corresponding cassettes have undergone significant improvements, offering huge gear ranges, and fast, reliable shifting. In the last 20 years, almost every part of a bike has been revised, making them more efficient, lighter and, above all, more robust. Mountain bikes have come a long way and they don’t seem to stop evolving. ![]()
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