The Shimano Deore M5100 Rear Derailleur is a dependable 11-speed rear derailleur for cycling. It features a super low profile design and optimized slant angle for light shifting action. The Shadow Plus design uses a chain stabilising switch to reduce chain bounce in rough terrain, maintaining a stable drive and shifting. A single tension spring prevents contact with the chainstay, resulting in a silent ride. The derailleur also features 13T pulleys and decreased derailleur tension to prevent high chain tension in low gears. Direct cable routing prevents snagging from trail side hazards. The derailleur has a wide alloy links and pivot body, fluorine-coated link pin bushings, and a strong return spring for a positive shifting feel. It also features durable 13T bearing pulleys for low friction. The top normal spring uses the spring to select higher gears. It has a max low sprocket of 51T and a 40T capacity SGS cage, making it suitable for 1x 11-speed systems.
The Shimano Deore M5100 Rear Derailleur is a dependable 11-speed rear derailleur for cycling. It features a super low profile design and optimized slant angle for light shifting action. The Shadow Plus design uses a chain stabilising switch to reduce chain bounce in rough terrain, maintaining a stable drive and shifting. A single tension spring prevents contact with the chainstay, resulting in a silent ride. The derailleur also features 13T pulleys and decreased derailleur tension to prevent high chain tension in low gears. Direct cable routing prevents snagging from trail side hazards. The derailleur has a wide alloy links and pivot body, fluorine-coated link pin bushings, and a strong return spring for a positive shifting feel. It also features durable 13T bearing pulleys for low friction. The top normal spring uses the spring to select higher gears. It has a max low sprocket of 51T and a 40T capacity SGS cage, making it suitable for 1x 11-speed systems.
The Shimano Deore M5100 Rear Derailleur is a dependable 11-speed rear derailleur for cycling. It features a super low profile design and optimized slant angle for light shifting action. The Shadow Plus design uses a chain stabilising switch to reduce chain bounce in rough terrain, maintaining a stable drive and shifting. A single tension spring prevents contact with the chainstay, resulting in a silent ride. The derailleur also features 13T pulleys and decreased derailleur tension to prevent high chain tension in low gears. Direct cable routing prevents snagging from trail side hazards. The derailleur has a wide alloy links and pivot body, fluorine-coated link pin bushings, and a strong return spring for a positive shifting feel. It also features durable 13T bearing pulleys for low friction. The top normal spring uses the spring to select higher gears. It has a max low sprocket of 51T and a 40T capacity SGS cage, making it suitable for 1x 11-speed systems.
The Shimano Deore M5100 Rear Derailleur is a dependable 11-speed rear derailleur for cycling. It features a super low profile design and optimized slant angle for light shifting action. The Shadow Plus design uses a chain stabilising switch to reduce chain bounce in rough terrain, maintaining a stable drive and shifting. A single tension spring prevents contact with the chainstay, resulting in a silent ride. The derailleur also features 13T pulleys and decreased derailleur tension to prevent high chain tension in low gears. Direct cable routing prevents snagging from trail side hazards. The derailleur has a wide alloy links and pivot body, fluorine-coated link pin bushings, and a strong return spring for a positive shifting feel. It also features durable 13T bearing pulleys for low friction. The top normal spring uses the spring to select higher gears. It has a max low sprocket of 51T and a 40T capacity SGS cage, making it suitable for 1x 11-speed systems.
Last updated at 07/03/2026 14:24:17
Shimano Deore M5100 Rear derailleur, 11-Speed, Shadow+, SGS Long cage,Black
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Compatible for Shimano Deore M5100 M5120 SGS, 11 Speed Shadow Long Cage Rear Derailleur for Mountain Bike
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originally posted on balfesbikes.co.uk
Great derailleurSmoothGood quality. Shimano10/10
originally posted on ebay.com
This is a better quality product to use with a 10 or 11 speed 11-50 or 11-51 MTB cassette and it does not require a derailleur extension. It is also strong enough for use with Bafang retro fit e-motor.
originally posted on REI
This review is about the Shimano M5100 group set as a whole. I made my first foray into mountain biking a few months ago with the purchase of a gently used Orbea MX50 mountain bike. It came with a Shimano Atlus 3x8 group set (3 gears/cogs in front, 8 gears/cogs in back for those as new to this as I recently was). This group set has been a HUGE upgrade.I switched everything to 1x11 which required buying a new crank, sprocket, chain, derailleur, annd shifter. I have plenty of gear range and it is SO MUCH more functional. This group set has really changed my bike for the better!Keep in mind you will probably need to buy some special tools, grease, etc. I did the upgrade myself and it’s pretty involved but if you’re mechanical, it’s definitely a job that can be done ... MoreThis review is about the Shimano M5100 group set as a whole. I made my first foray into mountain biking a few months ago with the purchase of a gently used Orbea MX50 mountain bike. It came with a Shimano Atlus 3x8 group set (3 gears/cogs in front, 8 gears/cogs in back for those as new to this as I recently was). This group set has been a HUGE upgrade.I switched everything to 1x11 which required buying a new crank, sprocket, chain, derailleur, annd shifter. I have plenty of gear range and it is SO MUCH more functional. This group set has really changed my bike for the better!Keep in mind you will probably need to buy some special tools, grease, etc. I did the upgrade myself and it’s pretty involved but if you’re mechanical, it’s definitely a job that can be done in a basement or garage. No regrets at all!
| Season | Year-round |
| Included Components | Shimano Deore |
| Product dimensions | 12 x 9 x 17 cm; 462 Grams |
| Auto part position | Rear |
Shimano Deore M5100 Rear derailleur, 11-Speed, Shadow+, SGS Long cage,Black
Free delivery
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
Compatible for Shimano Deore M5100 M5120 SGS, 11 Speed Shadow Long Cage Rear Derailleur for Mountain Bike
Affiliate Disclosure: We may receive a small commission for purchases made through this link at no extra cost to you. This helps support our site. Thank you!
SHIMANO DEORE M5100 11Speed Derailleur SHADOW RD-M5100 SGS 1x11S SL-M5100-R RD-M5120 11 Speed
Free delivery
SHIMANO DEORE M5100 11S Derailleur SHADOW RD-M5100 SGS 1x11S SL-M5100-R RD-M5120 11 Speed Mountain
Free delivery
Shimano DEORE M5100 M5120 Rear Derailleur SGS 11 Speed Bike Bicycle Rear Derailleur For Mountain
Delivery $15.31
Great derailleurSmoothGood quality. Shimano10/10
This is a better quality product to use with a 10 or 11 speed 11-50 or 11-51 MTB cassette and it does not require a derailleur extension. It is also strong enough for use with Bafang retro fit e-motor.
This review is about the Shimano M5100 group set as a whole. I made my first foray into mountain biking a few months ago with the purchase of a gently used Orbea MX50 mountain bike. It came with a Shimano Atlus 3x8 group set (3 gears/cogs in front, 8 gears/cogs in back for those as new to this as I recently was). This group set has been a HUGE upgrade.I switched everything to 1x11 which required buying a new crank, sprocket, chain, derailleur, annd shifter. I have plenty of gear range and it is SO MUCH more functional. This group set has really changed my bike for the better!Keep in mind you will probably need to buy some special tools, grease, etc. I did the upgrade myself and it’s pretty involved but if you’re mechanical, it’s definitely a job that can be done ... MoreThis review is about the Shimano M5100 group set as a whole. I made my first foray into mountain biking a few months ago with the purchase of a gently used Orbea MX50 mountain bike. It came with a Shimano Atlus 3x8 group set (3 gears/cogs in front, 8 gears/cogs in back for those as new to this as I recently was). This group set has been a HUGE upgrade.I switched everything to 1x11 which required buying a new crank, sprocket, chain, derailleur, annd shifter. I have plenty of gear range and it is SO MUCH more functional. This group set has really changed my bike for the better!Keep in mind you will probably need to buy some special tools, grease, etc. I did the upgrade myself and it’s pretty involved but if you’re mechanical, it’s definitely a job that can be done in a basement or garage. No regrets at all!
Huge upgrade over microshift 10 speed. Paired with an XT shifter it is a really premium drivetrain. Excellent performance, durability, and value.
Brilliant piece of kit handles everything only thing shimano could of done is add a lock button to it when you take rear wheel out like sram mechs have to lock the mech tention otherwise superb
It does the job for a good price. No complaints from me 👍🏿
The derailleur shift perfectly and easy to adjust. It also has a clutch which is highly needed on the trails. It might not be an XT but it delivers just the same and for a few dollars less.
The new Shimano X100 drivetrains are fantastic. Solid shifting and great range of gears. The ability to go up to 51t cassette makes the climbs far easier. So good I ended up getting a 6100 drivetrain for my other bike.
Great long cage RD for setting up 1x 46/51T cassettes. Make sure the B stop ring is in the right place when fixing to the hanger. The B stop screw was about right out of the box for a 46T cassette. I used a 116 link chain for a 46T cassette. Super clean shifting.
Took me a while to get my 11-speed dialed in to the newer wide gear spread, but this derailleur works perfectly with 11-speed shifters, 11-speed chain, a 30T chainring, and an 11-51T Sunrace cassette.
| Season | Year-round |
| Included Components | Shimano Deore |
| Product dimensions | 12 x 9 x 17 cm; 462 Grams |
| Auto part position | Rear |
