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Deore Rd-M5120 Rear Derailleur

Q: I have an older mtn bike with a 10speed deore. Can I run this derailleur with my current shimano 10sp shifter? The shimano deore sl-m610?

I believe that Shimano's 10 spd mtn shifters are pretty much the same, regardless of the year. I'm using a 10 spd Zee shifter with it and it works fine.

Q: will this work on a 10 s road bike with 11x42 (rear)?

I honestly don't know, but it is designed for use with 42-46T cassettes as long as the shifter has the same pull ratio, theoretically it will work with both 10- and 11-speed shifters. Google says a mtb derailleur should work.

Q: Can i use this with my 9 speed shifter and 9 speed cassette?

Not out of the box. When Shimano went to 10 speed, they altered the shifter/derailleur pull. JTek may make a pulley that will allow you to do so, but you'll need to visit their website and pore through the compatibility charts there. If you find one, then you'll need to find a retailer that carries it. Honestly, it would be easier just to find a 9 speed derailleur unless you already have this derailleur and need to find a solution to get it to work.

Product ID: 434505662

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Details

Brand
SHIMANO
Color
Black
Material
Aluminum
Item Weight
203 Grams
Mounting Type
Braze-On Mount

🔇Chain stabilizer for quiet ride

⚙️41t max capacity

🚵‍♂️SHIMANO SHADOW RD+ low profile

Frequently Bought Together

Shimano Deore Rd-M5120 Rear Derailleur

SHIMANO SL-M6000 Deore Shift Lever, Band-on, 10-Speed, Right Hand

Shimano Deore CS-M4100-10 Cassette - 10-Speed, 11-46t, Silver

Description

🚵‍♂️ Shift like a pro, conquer every trail with Shimano Deore precision!

QUIET CONFIDENCE - Chain stabilizing tech minimizes chain drop and drivetrain noise on rugged terrain.
ROCK SMART DESIGN - Low-profile SHIMANO SHADOW RD+ protects your derailleur from trail hazards.
VERSATILE CAPACITY - Handles up to 42t (2x setups) and 46t (1x setups) for all your MTB adventures.
LIGHTWEIGHT DURABILITY - Crafted from aluminum for a perfect balance of strength and weight savings.
PRECISION SHIFTING MASTERY - Supports 10 & 11-speed HG-X cassettes for smooth, reliable gear changes.

The Shimano Deore RD-M5120 rear derailleur features a rugged aluminum build and SHIMANO SHADOW RD+ low-profile design to protect against trail damage. Compatible with 10 and 11-speed HG-X cassettes, it supports up to 46t gearing capacity, delivering smooth, quiet, and reliable shifting performance for serious mountain bikers.

Specifications

Product Dimensions	8"L x 5"W x 4"H
Manufacturer	Shimano
UPC	192790618548
Item Package Dimensions L x W x H	7.76 x 4.92 x 3.7 inches
Package Weight	0.44 Kilograms
Item Dimensions LxWxH	8 x 5 x 4 inches
Brand Name	SHIMANO
Warranty Description	Limited Warranty
Model Name	Rear Derailleur
Suggested Users	mens
Number of Items	1
Part Number	ERDM5120SGS
Style	Rear Derailleur
Included Components	Rear Derailleur
Size	10/11 Speed
Sport Type	Cycling

Have a Question? See What Others Asked

I have an older mtn bike with a 10speed deore. Can I run this derailleur with my current shimano 10sp shifter? The shimano deore sl-m610?

will this work on a 10 s road bike with 11x42 (rear)?

Can i use this with my 9 speed shifter and 9 speed cassette?

Will this fit a 11t-46t 10 speed cassette?

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