Eightpins Stiffshifter derailleur dropout reinforcement Compatible with Shimano XTR - RD-M9100 12s Mechanical
Eightpins Stiffshifter derailleur dropout reinforcement Compatible with Shimano XTR - RD-M9100 12s Mechanical
Last 4 pieces available in stock
In stock. Delivery in 24 hours
Shipping costs (GERMANY): 10.90
Expected arrived: 28/09/2026
UDH derailleur hanger protection against breakage and deformation
Does the rear derailleur make noise after a fall or transport? Broken UDH derailleur hanger? Is the e-bike's derailleur bouncy during shifting under load? Stiffshifter is the SOLUTION to your problems!
Even a slight impact against the rear derailleur or on the trail can bend the UDH derailleur hanger, ending your ride. Moreover, UDH derailleur hangers have a thin structure and can break easily in the event of a fall or collision and offer insufficient resistance to the high forces exerted by modern e-MTBs. Stiffshifter stiffens the UDH derailleur hanger and protects the rear derailleur from misalignment, ensuring clean and reliable shifting on every trail.
Compatible with all UDH derailleur hangers
Pin reinforcement for derailleur mounting
High-strength CNC-machined aluminum
Weight: 17.3 grams
- Particularly suitable for use on E-bikes and e-MTBs
- The Stiffshifter stabilizes the UDH derailleur hanger from the outside
- Support is provided by the rear derailleur; thanks to its Plug & play configuration, it can be installed in just a few minutes
- A pin acts directly on the rear derailleur mounting bolt
- This provides additional support to the derailleur hanger, offering greater rigidity in the UDH system for significantly more precise shifting
- Effectively prevents deformation or breakage of the derailleur hanger
- Replaceable derailleur hangers were invented as a predetermined breaking point for the frame
- The frame hanger for a UDH derailleur hanger is 18 mm thick and is therefore extremely stable
- The wall thickness of the Stiffshifter at the mounting point is 1.5 mm
- In the event of a violent impact against the rear derailleur or the Stiffshifter, the Stiffshifter breaks to prevent damage to the frame
- Compatible with Shimano XTR - RD-M9100 12-speed mechanical
How to install Stiffshifter
1. Loosen and remove the thru axle
2. Remove the UDH screw
3. Insert the Stiffshifter pin into the rear derailleur screw
4. Mount and tighten the stiffshifter with the UDH screw.
5. Reinsert the quick-release axle
6. Assembly completed
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