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.

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.

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.

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Description

🚵‍♂️ Shift like a pro, ride like a legend.

CONSISTENT PRECISION - Engineered for reliable, crisp shifting even on the roughest trails—never miss a beat.
TRAIL READY DURABILITY - Low-profile design minimizes damage from rocks and trail debris—ride fearless.
WHISPER QUIET SHIFTING - Shadow RD+ tech eliminates chain slap and noise for smooth, stealthy rides.
WIDE GEAR RANGE MASTERY - Long SGS cage supports up to 46T sprockets for ultimate versatility on any terrain.
CROSS COMPATIBLE PERFORMANCE - Seamlessly works with both 10- and 11-speed HG-X drivetrains for flexible upgrades.

The Shimano Deore RD-M5120 rear derailleur combines advanced Shadow RD+ chain stabilization with a rugged low-profile design, supporting wide-range 10- and 11-speed drivetrains. Built for mountain bikers demanding quiet, precise, and durable shifting on technical trails, it handles up to 46T sprockets with ease, ensuring smooth performance and rock-solid reliability.

Specifications

ASIN	B089KDV5C7
Best Sellers Rank	#69,715 in Sporting Goods ( See Top 100 in Sporting Goods ) #27 in Bike Rear Dérailleurs
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (208)
Included Components	1 x Shimano Deore RD-M5120-SGS 10/11 Speed Rear Derailleur, Black
Item Dimensions L x W x H	20.3L x 12.7W x 10.2H centimeters
Item Type Name	Rear Derailleur
Item Weight	203 Grams
Manufacturer	Shimano Inc.
Manufacturer Part Number	ERDM5120SGS
Material Type	Aluminum
Model Number	Shimano
Mount Type	Braze-On Mount
Number of Teeth	42
UPC	192790618548
Warranty Description	No Warranty

Reviews

J**E

Easy to install , clutch is a useful feature. When set up properly the chain stays where it belongs at all times .

16.10.2025

B**N

Ottimo deragliatore preciso e silenzioso

5.12.2025

D**E

Cooles Schaltwerk. Funktioniert sehr gut mit dem Deore-Schalthebel. Ich benutze es in einem 2x10-Antrieb an einem HT MTB 27,5-Zoll-Bike. Kassette 11-42, Kurbel 26-36.

24.06.2025

D**N

Exactly what I wanted and Shimano reliability. Gave new life to a 10 year old mountain bike.

22.03.2026

T**T

My recumbent requires a long cage shifter due to its long & convoluted chain path. This is a perfect replacement for the Shimano Dura Ace RD-7700, and a perfect mare to Shimano SL-BS77 Dura Ace Double/Triple Bar End Shifters. Simple to install, and very smooth shifting.

6.09.2025

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