RD-M5120 Deore Rear Derailleur
Deore M5120 Shadow plus 10/11-speed rear derailleur for dependable shifting performance and durability. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride. Direct cable routing prevents snagging from any trail side hazards. Wide alloy links and pivot body. Fluorine-coated link pin bushings. Strong return spring for a positive shifting feel. Durable 11T bearing pulleys for low friction. Top normal spring uses the spring to select higher gears. HG-X11 11-speed and HG-X 10-speed compatible. Max low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed). 41T capacity SGS cage.
Deore M5120 Shadow plus 10/11-speed rear derailleur for dependable shifting performance and durability. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride. Direct cable routing prevents snagging from any trail side hazards. Wide alloy links and pivot body. Fluorine-coated link pin bushings. Strong return spring for a positive shifting feel. Durable 11T bearing pulleys for low friction. Top normal spring uses the spring to select higher gears. HG-X11 11-speed and HG-X 10-speed compatible. Max low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed). 41T capacity SGS cage.
Deore M5120 Shadow plus 10/11-speed rear derailleur for dependable shifting performance and durability. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride. Direct cable routing prevents snagging from any trail side hazards. Wide alloy links and pivot body. Fluorine-coated link pin bushings. Strong return spring for a positive shifting feel. Durable 11T bearing pulleys for low friction. Top normal spring uses the spring to select higher gears. HG-X11 11-speed and HG-X 10-speed compatible. Max low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed). 41T capacity SGS cage.
Deore M5120 Shadow plus 10/11-speed rear derailleur for dependable shifting performance and durability. Shadow plus features a super low profile design and optimized slant angle for super light shifting action. Shadow Plus uses a chain stabilising switch that when on will reduce chain bounce in rough terrain maintaining more stable drive and shifting. Single tension spring prevents contact with the chainstay resulting in a silent ride. Direct cable routing prevents snagging from any trail side hazards. Wide alloy links and pivot body. Fluorine-coated link pin bushings. Strong return spring for a positive shifting feel. Durable 11T bearing pulleys for low friction. Top normal spring uses the spring to select higher gears. HG-X11 11-speed and HG-X 10-speed compatible. Max low sprocket: 46T (1x10-speed), 42T (2x11/2x10-speed). 41T capacity SGS cage.
in 16 offers
The lowest price for RD-M5120 Deore Rear Derailleur right now is $48.00 at Banana Industries, compared across 11 retailers.
The all-time low was $29.99 on 18 Sept 2024 — today's price is 60% above the lowest ever. It has been notably cheaper before — worth setting a price alert.
Prices last updated 13 May 2026.
Last updated at 13/05/2026 07:46:59
Shimano Deore Rd-M5120 Rear Derailleur
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Shimano Deore RD-M5120 10 / 11 Speed Derailleur
Delivery $65.75
Shimano Deore 10/11SPD Rear Derailleur-RD-M5120-SGS
Delivery $38.64
Shimano Deore Rd-m5120-sgs Shadow Rd+ 10s/11s Rear Derailleur Super
Delivery $10.64
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 Rd-m5120-sgs Shadow Rd+ 10s/11s Rear Derailleur Super
Free delivery
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Shimano Deore Rd-m5120 Rear Derailleur - 10-11 Speed
Delivery $30.80
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Shimano Deore M5120 10-11 Speed Rear Derailleur With Shadow Rd+ Tech,
Delivery $36.96
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Shimano Rd-m5120 Deore Rear Derailleur Shadow+ Sgs 10/11-speed Rear
Free delivery
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Shimano REAR DERAILLEUR, RD-M5120, DEORE, SGS 10/11-SPEED, TOP NORMAL, SHADOW PLUS DESIGN, DIRECT ATTACHMENT (DIRECT MOUNT COMPATIBLE) - OS / Black
Delivery between 20–23 May $19.99
shimano deore rd-m5120 switchboard
Delivery between 17–21 May $15.52
originally posted on jensonusa.com
On a 1x10 with a 42x11 cassette the actuator arm rests just a couple millimeters from the cassette when in the highest gear. If you have horizontal dropouts like on a surly it makes it very difficult to remove the rear wheel, in addition to it being concerning how close the derailleur sits to the cassette. shifts fine though.
originally posted on evogear.com
If you're in the market for an inexpensive derailleur, Shimano cannot be beat. I've got mine in a 1x10 setup with an 11-42 cassette, works flawlessly. Great derailleur at a very affordable price.
originally posted on REI
Very High-Quality derailleur. Allows using a 42-tooth cassette. The chain guide wheels have side to side play. This may be fine, but I installed the sealed bearing pulleys from my old Shimano XT.
| Compatible chain | HG-X11 11-speed, HG-X 10-speed |
| Max. front difference | 10T |
| Speeds | 11/10 |
| Total capacity | 41T |
Shimano Deore Rd-M5120 Rear Derailleur
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 RD-M5120 10 / 11 Speed Derailleur
Delivery $65.75
Shimano Deore 10/11SPD Rear Derailleur-RD-M5120-SGS
Delivery $38.64
Shimano Deore Rd-m5120-sgs Shadow Rd+ 10s/11s Rear Derailleur Super
Delivery $10.64
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 Rd-m5120-sgs Shadow Rd+ 10s/11s Rear Derailleur Super
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!
On a 1x10 with a 42x11 cassette the actuator arm rests just a couple millimeters from the cassette when in the highest gear. If you have horizontal dropouts like on a surly it makes it very difficult to remove the rear wheel, in addition to it being concerning how close the derailleur sits to the cassette. shifts fine though.
If you're in the market for an inexpensive derailleur, Shimano cannot be beat. I've got mine in a 1x10 setup with an 11-42 cassette, works flawlessly. Great derailleur at a very affordable price.
Very High-Quality derailleur. Allows using a 42-tooth cassette. The chain guide wheels have side to side play. This may be fine, but I installed the sealed bearing pulleys from my old Shimano XT.
The 5120 rear derailleur offers flexibility and excelllent shifting for under $50. The trade-off is that is heavier than costlier options: about 105 grams heavier than 11-speed XT. But it's compatible with both 10- and 11-speed Shimano MTB drivetrains, and has an effective clutch to maintain even chain tension over gnarly turf. Max rear sproket is 46 teeth in a 1X system, and 42 teeth in a 2X. Use the 5100 if you want 1X 51 teeth.
Built up a bike and had a short cage but wouldn’t work for an 11-32 cassette. Replaced with this one and a chain. Worked great. Plus it was on sale and shipped quick.
easy to set up and flexible for 1x or 2x - has a clutch . Shimano mid level parts are always top notch
Bought this a few months ago as I was changing from 1x12 to 1x10. So happy I did, Indexing is so much better on a 1x10 setup and derailleurs are less than half the price of a similar 1x12 one. Bent this derailleur recently in the woods, bike shop straightened it for me and it's being perfect since. If that was a 1x12, it would never be right again
Purchased this derailleur to replace my older one so I could use a bigger cassette range on my 10 speed mountain bike. Easy to install and works great!
Great price, great product, Cambria is simply AWESOME. Always a pleasure to buy from, and you can't go wrong with Deore components.
Planned for my retro-mod Trek 850, looking forward to an inexpensive 1x11 drivetrain
| Compatible chain | HG-X11 11-speed, HG-X 10-speed |
| Max. front difference | 10T |
| Speeds | 11/10 |
| Total capacity | 41T |
