Shimano Deore XT RD-M8100-GS 12-Speed Rear Derailleur — Medium Cage (GS), 1x12, SHADOW RD+ Clutch, 10-45T, Black/Grey

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

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