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Shimano 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.

4.6/5

Product ID: 434505662

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Details

Brand
SHIMANO
Color
Black
Material
Aluminum
Item Weight
203 Grams
Case Material
Aluminium

🔇Chain stabilizer for quiet shifting

⚙️41t max cassette capacity

🚵‍♂️SHIMANO SHADOW RD+ low profile design

Description

🚵‍♂️ Shift into the future of trail dominance with Shimano Deore M5120!

QUIET CONFIDENCE - Chain stabilizer technology minimizes chain drop and noise on rugged rides
LIGHTWEIGHT STRENGTH - Aluminum construction balances durability with minimal weight for peak performance
ROCK SMART DURABILITY - Low-profile SHIMANO SHADOW RD+ design protects from trail hazards
VERSATILE COMPATIBILITY - Handles 2x11, 2x10, and 1x10 gearing setups with up to 46t cassettes
PRECISION SHIFTING MASTERY - Supports 10 & 11-speed HG-X cassettes for seamless gear transitions

The Shimano Deore RD-M5120 Rear Derailleur features a robust aluminum build and SHIMANO SHADOW RD+ low-profile design to protect against trail damage. It supports a wide cassette range up to 46 teeth and is compatible with 10 and 11-speed HG-X drivetrains. Chain stabilizer technology ensures quiet, reliable shifting across all gears, making it the ideal upgrade for serious mountain bikers seeking precision and durability.

Specifications

Mounting Type	Braze-On Mount
Number of Teeth	42
Product Dimensions	8"L x 5"W x 4"H
Manufacturer	Shimano
UPC	192790618548
Item Package Dimensions L x W x H	6.3 x 4.72 x 2.32 inches
Package Weight	0.35 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
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?

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

Neha S.

Excellent communication throughout the order process. Product is perfect.

2 weeks ago

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

Farhan Q.

The delivery time was excellent, and the packaging was secure.

2 months ago