Shimano Deore XT RD-M8120-SGS 12-Speed Rear Derailleur — Long Cage (SGS), 1x12 /
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.
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