Stiffshifter - UDH derailleur hanger protection against breakage and bending

Stiffens the UDH derailleur hanger and protects the Derailleur from misalignment—for clean and reliable shifting on every trail

Nie wieder verbogene UDH-Schaltaugen mit dem Eightpins Stiffshifter. Das Video zeigt die Montage des Stiffshifters und die Vorteile: Weniger UDH Flex, Keine UDH Verbiegung, Keine Panne wegen UDH Schaltauge.

Are you familiar with this problem?

Derailleur rattling after a fall or transport?

Even a slight bump against the Derailleur in the trunk or on the trail can bend the UDH derailleur hanger – and your tour is over.

UDH derailleur hanger broken

The UDH derailleur hanger is narrow in design and can break easily in the event of a fall or collision. Without a replacement, the tour is over.

E-bike gears feel elastic when shifting under load?

The UDH derailleur hanger is flexible and offers insufficient support for the high forces generated by modern e-MTBs.

Frustrating. The UDH problem

The UDH derailleur hanger is standardized – that's good. But it's underpowered for modern, bulky Derailleurs. Even slight impacts during transport or on the trail can bend or break it.

The result:

❌ Inaccurate gear changes
❌ Rattling in the drive
❌ Tour canceled due to bent Derailleur hanger
❌ Expensive replacement derailleur hangers (€30-50)
❌ Often unavailable when you need them

The solution: Stiffshifter

The Stiffshifter stabilizes your UDH derailleur hanger from the outside and prevents flex, breakage, and bending—with every shift, every fall, and every transport.

Pre-order now

Your benefits

  • Einfache Installation des Stiffshifters in 2 Minuten ohne Spezialwerkzeug

    Easy to install

    • Loosen and pull out the thru axle
    • Remove UDH screw
    • Insert the stiffshifter pin into the screw of the Derailleur.
    • Install the stiffshifter with the UDH screw and tighten it.
    • Reinsert the quick-release axle
    • Installation complete
  • Maximaler Schutz gegen UDH Schaltauge Bruch und Verbiegung

    Maximum protection

    • The Stiffshifter stabilizes the UDH derailleur hanger from the outside.
    • Support is provided by the Derailleur.
    • A pin engages directly with the mounting bolt of the Derailleur.
    • This provides additional support for the derailleur hanger.
    • Bending or breakage of the Derailleur hanger is effectively prevented
Bild zeigt den Hinterbau und Schaltwerks Bereiche eines Rotwild REX 900 E-Bike mit dem Eightpins Stiffshifter und einer Messeinrichtung mit Messuhr um das flexen eines UDH Schaltauges zu messen.

LESS UDH DERAILUR HANGER FLEXING

Modern derailleurs can be subjected to high forces when shifting gears, especially on E-bikes. The UDH derailleur hanger is thin and offers little support. The Stiffshifter supports and performs stiffening on the derailleur hanger for more precise shifting.

Field tests with a dial gauge have shown that the rear derailleur with the Stiffshifter support exhibits significantly less flex than the UDH derailleur hanger alone without support.

Video zeigt den zwei Schaltwerks Bereiche eines Rotwild REX 900 E-Bike mit dem Eightpins Stiffshifter und einer Messeinrichtung mit Messuhr um das flexen eines UDH Schaltauges zu messen. Links im Bild sieht man die Messung mit Stiffshifter und rechts ohne Stiffshifter. Am Zeigerausschlag erkennt man deutlich, dass der UDH Schaltauge mit Stiffshifter Versteifung deutlich wenige flext.

Why you need the Stiffshifter

Szenario Ohne Stiffshifter Mit Stiffshifter
Leichter Sturz am Trail ❌ Schaltauge verbiegt sich ✅ Geschützt und stabilisiert
Transport im Kofferraum ❌ Hohes Risiko für Verbiegung ✅ Dauerhaft stabilisiert
Schalten unter Last ⚠️ Flex, ungenaue Schaltung ✅ Präzise, kein Flex
Ersatz Schaltaugen pro Jahr 1–2× (30–100€) 0×
Pannenanfälligkeit ❌ Grosses Risiko ✅ Entspannt fahren
Stiffshifter Titangrau für Shimano Di2 XT/XTR 12-fach Schaltwerk
Stiffshifter Schwarz für Shimano XT/XTR 12-fach Schaltwerk
Stiffshifter Silber für SRAM Eagle und Eagle AXS 12-fach Schaltwerk

✅ Compatible rear derailleurs

UDH derailleur hanger protector for SRAM:

  • SRAM GX Eagle / GX Eagle AXS 12-speed
  • SRAM X0 Eagle / X0 Eagle AXS 12-speed
  • SRAM XX1 Eagle / XX1 Eagle AXS 12-speed
  • SRAM XO1 Eagle / XO1 Eagle AXS 12-speed

Derailleur stiffening UDH For Shimano 12-speed:

  • Shimano Deore XT M8100 12-speed
  • Shimano XTR M9100 12-speed
  • Shimano Deore XT Di2 M8150 12-speed
  • Shimano XTR Di2 M9150 12-speed

❌ Not compatible with:

  • Old derailleur hangers (non-UDH standard)
  • Derailleurs without UDH mounting
  • 10-speed and 11-speed derailleurs with classic Derailleur hangers
  • Road bike rear derailleurs

🎨 Available colors

The Stiffshifter is in three colors available:

  • Black
  • titanium gray 
  • silver 
Pre-order now
  • Eightpins Stiffshifter UDH Schaltauge Verstärkung gegen verbogenes UDH Schaltauge stützt das Shimano Di2 Schaltwerk ab. Verhindert den Bruch von UDH Schaltauge. Stabiliserte und versteift den UDH Hanger.
  • Einfache Installation des Stiffshifters in 2 Minuten ohne Spezialwerkzeug
  • Maximaler Schutz gegen UDH Schaltauge Bruch und Verbiegung
  • Eightpins Stiffshifter UDH Schaltauge Verstärkung für kompatible Schaltwerke: UDH Schaltauge Schutz für SRAM: SRAM GX Eagle / GX Eagle AXS 12-fach SRAM X0 Eagle / X0 Eagle AXS 12-fach SRAM XX1 Eagle / XX1 Eagle AXS 12-fach SRAM XO1 Eagle / XO1 Eagle AXS 12-fach Schaltwerk Versteifung UDH Für Shimano 12-fach: Shimano Deore XT M8100 12-fach Shimano XTR M9100 12-fach Shimano Deore XT Di2 M8150 12-fach Shimano XTR Di2 M9150 12-fach Gegen Bruch oder Verbiegung des UDH Schaltauge
  • Eightpins Stiffshifter UDH Schaltauge Verstärkung gegen verbogenes UDH Schaltauge. Stützt das Shimano XT/XTR Schaltwerk ab. Verhindert rattern in der Schaltung und flexing des UDH Hangers.
  • Eightpins Stiffshifter UDH Schaltauge Versteifung für kompatible Schaltwerke: UDH Schaltauge Schutz für SRAM: SRAM GX Eagle / GX Eagle AXS 12-fach SRAM X0 Eagle / X0 Eagle AXS 12-fach SRAM XX1 Eagle / XX1 Eagle AXS 12-fach SRAM XO1 Eagle / XO1 Eagle AXS 12-fach Schaltwerk Versteifung UDH Für Shimano 12-fach: Shimano Deore XT M8100 12-fach Shimano XTR M9100 12-fach Shimano Deore XT Di2 M8150 12-fach Shimano XTR Di2 M9150 12-fach Gegen Bruch oder Verbiegung des UDH Schaltauge. Kein rattern in der Schaltung.
  • Eightpins Stiffshifter UDH Hanger Versteifung gegen verbogenes UDH Schaltauge stützt das Shimano XT/XTR Schaltwerk ab. Montiert auf einem Liteville 303.
  • Eightpins Stiffshifter UDH Schaltauge Verstärkung gegen verbogenes UDH Schaltauge stützt das Shimano Di2 Schaltwerk ab.
  • Shimano Di2 Derailleur on a Rotwild R.EX900 e-mountain bike Eightpins Stiffshifter UDH rear derailleur support and DJi motor in front of beautiful mountain scenery.
  • Eightpins Stiffschifter UDH Schaltauge Versteifung für Sram Eagle Schaltwerk in Titan Grau montiert auf einem Liteville 303
  • Eightpins Stiffschifter UDH Schaltauge Versteifung für Sram Eagle Schaltwerk in Silber montiert auf einem Liteville 303
  • Eightpins Stiffschifter UDH Schaltauge Versteifung für Sram Eagle Schaltwerk in schwarz montiert auf einem Liteville 303
1 12

Stiffshifter

€39,00
incl. VAT. Shipping will be charged at checkout.

Stiffshifter – Stiffening for the UDH derailleur hanger

The Eightpins Stiffshifter is the next evolutionary step for bikes with UDH derailleur hangers. Modern derailleurs are longer, wider, and more exposed than ever before – and the UDH derailleur hanger is simply too weak for this. Even slight contacts with rocks on the trail can cause derailleur hangers to bend.

This is where the Stiffshifter comes in: a small but incredibly effective upgrade, it performs stiffening on the connection between the frame, derailleur hanger, and rear derailleur. The result is significantly greater stability, more precise shifting, and reliable protection of the entire system against deformation – all combined in a single, smartly designed component for bikes with UDH derailleur hangers.

Upgrade your bike. Make your Derailleur hanger strong.

Why you need the Stiffshifter
  •  Protects your UDH derailleur hanger
    The UDH derailleur hanger is up to 50% thinner than many other derailleur hangers – perfect for compatibility, but prone to bending. The Stiffshifter significantly reduces this vulnerability.
  •  Stabilizes modern Derailleurs
    Due to the large size of today's derailleurs, enormous lever forces act directly on the derailleur hanger. The Stiffshifter absorbs these forces and distributes them more effectively throughout the structure.
  •  Prevents switching problems
    Even the smallest deviations in the derailleur hanger can lead to crooked gears, chain jams, or jumping cassette jumps. The Stiffshifter ensures permanently precise alignment.
  •  Massive stiffening through clever design
    A precise pin engages directly with the Derailleur's mounting screw, resulting in a significantly stiffer, more robust, and more durable connection.
  •  Easy installation – big impact
    The stiffshifter is mounted with the UDH screw, automatically engages with the Derailleur, and can be installed in just a few minutes.
Ideal for
  • Trail and enduro riders
  • Bikes with UDH standard
  • Situations involving frequent contact with stones
  • Drivers who expect the highest shifting precision
Technical highlights
  • Compatible with all UDH derailleur hangers
  • Pin stiffening for derailleur attachment
  • High-strength CNC-machined aluminum
  • Weight: 17.3 grams
  • Developed and manufactured in Austria
Stiffshifter – pre-order now and be the first to benefit

Important:The Stiffshifter is currently available asadvance orderavailable. This will ensure youyour place in the next production batch– will be delivered as soon as production is complete.

We are planning the first delivery in March!
All details

Frequently Asked Questions

Why does my UDH derailleur hanger keep breaking?

UDH derailleur hangers are made of soft aluminum and are designed to break in the event of a crash in order to protect the frame.

Problem: Modern derailleurs are so long and exposed that even slight contacts are enough.

The Stiffshifter solves this problem: It provides additional support for the derailleur and distributes forces more effectively. The derailleur hanger only breaks in the event of really hard impacts—no longer with every little stone on the trail.
What should I do if my UDH derailleur hanger is bent?

Short term: Replace UDH derailleur hanger (€30-50, often unavailable).

Long term: Install a stiff shifter and solve the problem permanently. The stiff shifter prevents your UDH derailleur hanger from bending at all – during every fall, every transport, every gear change.

Advantage: Once mounted = permanent protection. No more buying replacement Derailleur hangers, no more tour interruptions.
Where is the Stiffshifter manufactured?

Made in Austria! The Stiffshifter is developed and produced in Enns, Upper Austria – with the highest quality standards and local manufacturing.
For which riders is the Stiffshifter ideal?

Ideal for:
🏔️ Enduro and trail riders – Maximum protection in the event of a fall
🚴 Bike packers & touring cyclists – Safe transport, no breakdowns en route
🏁 racer – More precise shifting under load
🚗 frequent transporter – Protection in the trunk, on the bike rack
💪 Heavy Rider – greater stability under high loads
In short: For anyone who wants to protect their UDH derailleur hanger and shift more precisely.
Is there a warranty?

Yes! There is a Stiffshifter 30-day money-back guaranteeIf you are not satisfied, you can return it—no questions asked. Additionally: 2-year manufacturer's warranty for material and manufacturing defects.
Can I install the Stiffshifter myself?

Yes, absolutely! Installation is simple and requires only standard tools (Allen key). If you can change your thru axle yourself, you can also install the Stiffshifter.
How do I install the Stiffshifter?

The installation only takes 2 minutes:

1. Loosen and pull out the thru axle.
2. Remove the UDH screw.
3. Insert the Stiffshifter pin into the rear derailleur bolt.
4. Reinsert the UDH screw and tighten it.
5. Reinsert the thru axle
6. **Done!**
Is the Stiffshifter better than a stiffer derailleur hanger (e.g., Silca UDH)?

The Stiffshifter and stiffer derailleur hangers complement each other perfectlyA stiffer derailleur hanger reduces flex in the material, and the Stiffshifter offers additional mechanical support in the event of falls and transport – regardless of the material of the Derailleur hanger.
How heavy is the Stiffshifter?

The Stiffshifter weighs only approx. 17.3 grams – Barely noticeable, but with a big impact.
Does the Stiffshifter also prevent flex when shifting gears?

Yes! The derailleur is stabilized by the support on the mounting bolt and is less likely to move sideways when shifting under load. The result: more precise gear changes, especially uphill or under heavy loads.
Why does my UDH derailleur hanger bend so easily?

UDH derailleur hanger brackets are made of aluminum and standardized for maximum compatibility. However, modern derailleurs are significantly longer and heavier than in the past – the UDH derailleur hanger does not provide sufficient support. It can bend or break during transport, crashes, or heavy shifting. The Stiffshifter provides additional support for the derailleur at the mounting bolt, preventing bending.
Does the Stiffshifter also provide protection during transport?

Yes! The Stiffshifter permanently stabilizes your derailleur—not only while riding, but also when transporting your bike in a car, airplane, or on a bike rack. Once installed, your derailleur hanger is permanently protected.
Which derailleurs is the Stiffshifter compatible with?

✅ SRAM Eagle / Eagle AXS 12-speed
✅ Shimano XT/XTR 12-speed
✅ Shimano Di2 XT/XTR 12-speed

Is the Stiffshifter compatible with all Derailleur hangers?

No! The Stiffshifter is only compatible with UDH derailleur hangers.

Popular Eightpins products