What Is A UDH?
UDH is an abbreviation for Universal Derailleur Hanger. It is a system developed by SRAM to standardize the hangers used in mountain bikes. This system was introduced by SRAM in 2019, and since then, many mountain bike brands have started incorporating it into their designs.
If a rider has a bike with a UDH-compatible frame and the hanger breaks, they can go to almost any bike shop to get a replacement UDH hanger.
The Universal Derailleur Hanger made by SRAM comprises two parts - the hanger itself and the UDH bolt that secures the hanger to the dropout. Some frames may require a UDH frame washer, so it is advisable to check with the frame manufacturer to see if it is necessary.
What Is The Purpose Of A Derailleur Hanger?
A derailleur hanger is a crucial part of a bicycle that safeguards the rear derailleur and frame from damage during a severe collision. The hanger is structured to bend or break in order to prevent costly harm to the derailleur. By doing so, it not only extends the life of your bike but also helps you save money.
What Is Special About The UDH Hanger?
The UDH is a hanger that is specifically designed for use with thru-axles. While it shares some similarities with existing hangers, it also boasts some unique features that are still patent-pending. One of its standout features is that it prevents the chain from falling off the smallest cog. Even if your rear derailleur hits a rock, the UDH can rotate backward, safeguarding both your frame and derailleur. Additionally, the UDH is crafted to meet the specifications of every major MTB rear derailleur that is currently available on the market. It sits right in the middle of every derailleur specification. This means that it not only works with every derailleur, but these derailleurs are also already optimized for UDH.
Compatibility
The Universal Derailleur Hanger (UDH) is an excellent choice for mountain bikers who want to use a range of groupset manufacturers, including Shimano and Box, instead of being restricted to SRAM rear derailleurs. This gives consumers the freedom to choose from various components when building or upgrading their bikes. SRAM's decision to make the UDH compatible with other brands has made it a more universal and widespread option in the industry. Since its launch in 2019, many mountain bike brands have started producing UDH-compatible bikes. To make it even easier for customers, SRAM has provided a bike finder tool on its website so that they can check whether their frame uses the UDH standard.
Is The SRAM UDH Compatible With My Bike?
The SRAM Universal Derailleur Hanger (UDH) is only compatible with frames that have a hanger-less interface that meets the UDH specifications. This means that your bike must have been designed to work with the UDH, and it may not fit on every frame. You can find detailed information about the UDH standard by visiting www.universalderailleurhanger.com.