Shimano

Shimano Deore XT RD-M8120-SGS 12-Speed Rear Derailleur — Long Cage (SGS), 1x12 / 2x12, SHADOW RD+ Clutch, 10-45T, Black

Shimano Deore XT RD-M8120 is a genuine Shimano rear derailleur delivering precise, reliable shifting for mountain bike riders.

Genuine Shimano Deore — brand new in retail packaging.

Will it fit? This is a 12-Speed rear derailleur (Long Cage (SGS), 1x12/2x12, 10-45T). For Shimano 12-Speed mountain drivetrains — match speeds and cassette range.

Key Specifications

Brand Shimano
Series Shimano Deore XT RD-M8120
MPN RD-M8120
Type Rear Derailleur
Speeds 12-Speed
Key Spec Long Cage (SGS), 1x12/2x12, 10-45T
Material Aluminum / steel
Weight 284 g (10.0 oz)
Color Black
Country of Origin Japan
Condition Brand new — original Shimano retail packaging

Technology Highlights

  • ✓  SHADOW RD+ clutch keeps the chain taut and quiet, cutting chain slap and dropped chains on rough terrain.
  • ✓  HYPERGLIDE+ delivers fast, smooth, shockless shifting in both directions under load.
  • ✓  Built for 1x12/2x12 setups.
  • ✓  Optimized for 10-45T drivetrains.
  • ✓  Long cage (SGS) handles a wide cassette range.
  • ✓  Genuine Shimano quality — consistent performance and durability.

What's in the Box

  • 1 × Shimano Deore XT RD-M8120
  • Mounting hardware & documentation (as supplied)
  • Original Shimano retail packaging
Brand new in retail packaging. Ships from Ontario, California (US domestic) · Estimated delivery 3–5 business days · Free 30-day returns.
$79.99 USD
Regular price
Unit price
per

Pay in 4 interest-free installments of $133.12 with

Shimano Deore XT RD-M8120-SGS 12-Speed Rear Derailleur — Long Cage (SGS), 1x12 / 2x12, SHADOW RD+ Clutch, 10-45T, Black
$79.99 USD
Regular price
Unit price
per

Shimano Deore XT RD-M8120-SGS 12-Speed Rear Derailleur — Long Cage (SGS), 1x12 / 2x12, SHADOW RD+ Clutch, 10-45T, Black

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