Parts Shimano Deore RD-M5100 11 Speed Rear Derailleur

Unlock the versatility of wide-range 11-speed gearing with the Shimano Deore RD-M5100 11 Speed Rear Derailleur. Designed to pair with the Deore CS-M5100 11-51t cassette, this derailleur has a huge capacity which enables it to smoothly shift in and out of that monster 51t cog. Shimano’s Shadow Plus design creates a low-profile to help prevent damage from rocks and trail debris. Chain stabilising technology makes for a quiet drivetrain in all gear positions and reduces chain drop, slap and noise. Larger 13t pulleys allow for smooth operation, and reduced spring and chain tension in the low gears will reduce wear and tear and strain on the components.

Who’s this item for: Anyone with a Shimano 11 speed drivetrain that wants to upgrade to a wide range setup. Pair this up with a new longer chain and a wide-range cassette and you’ll be good to go.

Number of gears: This is an 11-speed derailleur.

Chain and cassette compatibility: This derailleur is designed to pair up with the Deore CS-M5100 11-51t cassette but it’ll also work well with other wide range 11-speed cassettes.

Max cassette range: 

• Minimum sprocket size: 11T
• Maximum sprocket size: 51T
• Total capacity: 40T

Cage length: SGS (long cage)

Jockey wheel tooth count (top / bottom): This derailleur uses 13T pulleys top and bottom.

Pros: Unlocks the potential for wide-range gearing on 11-speed MTB’s. Awesome price point.

Cons: Deore level derailleurs use bushings on the jockey wheels rather than the bearings found on higher-end models.