Shimano Deore XT RD-M8100-GS 12-Speed Rear Derailleur — Medium Cage (GS), 1x12,
Shimano Deore XT RD-M8100 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 (Medium Cage (GS), 10-45T). For Shimano 12-Speed mountain drivetrains — match speeds and cassette range.
Key Specifications
Brand | Shimano |
Series | Shimano Deore XT RD-M8100 |
MPN | RD-M8100 |
Type | Rear Derailleur |
Speeds | 12-Speed |
Key Spec | Medium Cage (GS), 10-45T |
Material | Aluminum / steel |
Weight | 284 g (10.0 oz) |
Color | Black / Grey |
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.
✓ Larger 13T sealed-bearing pulleys improve chain management and efficiency.
✓ Direct-mount interface is light and quick to set up or swap.
✓ Medium cage (GS) balances range and chain management.
✓ Genuine Shimano quality — consistent performance and durability.
What's in the Box
1 × Shimano Deore XT RD-M8100
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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