Shimano Alivio RD-M3100 Rear Derailleur - 9-Speed | Long Cage

Shimano Alivio RD-M3100 Rear Derailleur - 9-Speed | Long Cage Shimano

Shimano Alivio RD-M3100 Rear Derailleur - 9-Speed | Long Cage

Shimano Alivio RD-M3100 Rear Derailleur - 9-Speed | Long Cage

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Why Choose the Shimano Alivio RD-M3100 for Your 9-Speed MTB Build?

The Shimano Alivio RD-M3100 is a capable 9-speed MTB rear derailleur that brings Shadow RD low-profile design to an accessible price point, keeping the mechanism protected from trail obstacles while reducing chain slap and improving chain retention on rough terrain. The long SGS cage handles cassettes up to 36t with 45t total capacity, giving riders ample range for varied terrain without needing a clutch system. Shadow RD's compact form factor reduces the risk of damage from impacts without adding the weight or engagement resistance of an active clutch mechanism.

Compatible with Shimano 9-speed road and mountain shifters. Fits both Shimano Rear Direct Mount and standard 10x1 dropout hanger frames. MPN: ERDM3100SGS. A reliable, straightforward 9-speed rear derailleur for trail, cross-country, and recreational MTB builds.

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$42.99
$42.99 $48.00
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  • Estimated delivery: Aug 16 - Aug 20

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Specifications

  • MPN: ERDM3100SGS
  • Speed: 9-speed
  • Cage Length: Long (SGS)
  • Max Low Sprocket: 36t
  • Min Top Sprocket: 11t
  • Total Capacity: 45t
  • Shadow RD: Yes
  • Mount: Shimano Rear Direct Mount and standard 10x1
  • Shifter Compatibility: Shimano 9-speed road and mountain
  • Color: Black

FAQ

What frames does the RD-M3100 fit?

The RD-M3100 fits both Shimano Rear Direct Mount frames and standard 10x1 hanger frames, covering the majority of MTB and hardtail frame designs.

Is the RD-M3100 compatible with Shimano 9-speed road shifters?

Yes. Shimano 9-speed MTB and road derailleurs share cable pull compatibility, so the RD-M3100 works with Shimano 9-speed road shifters as well as MTB shifters.

Does the RD-M3100 have a clutch mechanism?

No. The RD-M3100 uses Shadow RD low-profile design for protection from obstacles but does not have an active clutch mechanism. For trails with heavy chain-slap concerns, an upgrade to SLX RD-M7000 with Shadow RD+ would add adjustable clutch stabilization.

Best For

Trail, cross-country, and recreational MTB riders running 9-speed Shimano drivetrains who need a reliable, wide-range rear derailleur with Shadow RD protection at an accessible price.

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