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❓1. How do I check the compatibility of the derailleur with my transmission?

  • Number of speeds : the derailleur must match exactly (10, 11, 12 speed).
  • Order type :
    SRAM ↔ works with SRAM controller.
    Shimano ↔ works with Shimano controller.
    Both systems are generally not compatible (different print).

  • Derailleur Capacity : must cover the size of largest sprocket (ex: 50/51/52 teeth in 12 speeds).
  • Screed :
    Short (SS) → Cassette at a small beach (Road, urban).
    Average (GS) → MTB XC / Trail.
    Long (SGS) → large cassettes (e.g.: 10–51).

  • Fixing : classic paw vs typical screed UDH (SRAM Transmission AXS).

❓2. How do I choose according to my practice (XC, trail, enduro, DH)?

  • XC/Marathon : Light weight, medium tread, precise and fast operation. Efficiency-oriented models (e.g. Shimano XT / SRAM GX).
  • Trail / All-Mountain : Robustness + wide speed range.
    Derailleurs with high-performance clutch (anti-shock/anti-chain).
  • Enduro : Reinforced derailleur, rigid cage, anti-breakage protection. Powerful clutch to avoid noise and derailments.
  • DH : Derailleur short cope, ultra resistant, Cassette very specific. Priority to chain retention more than speed range.

❓3. Which technologies and options to favor?

  • Clutch : essential in MTB → reduces chain skipping and noise.
  • Mechanical vs. electrical choice (AXS) :
    Mechanics → reliable, economical, easy to maintain.
    Electric (SRAM AXS) → exceptional precision, self-adjusting, cable-free, but more expensive.
  • Contoured Top Caster : improves precision in large gears.
  • Direct Mount (UDH Transmission) : Stiffer, more precise, designed for compatible modern frames.
    Very resistant to impacts.

❓4. What materials and what level of range to choose?

  • Aluminum : excellent weight/strength compromise.
  • Steel : very robust, ideal for small budget or intensive use.
  • Carbon / composite : light, often high-end, good rigidity.
  • Bearings :
    Simple rings → economic.
    Sealed bearings → better durability and fluidity.
  • Moving upmarket = + precision, + rigidity, + silence, + durability.

If you want to know more, discover our advice guide:

How to choose your rear derailleur MTB

How to properly adjust your rear derailleur MTB