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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Shimano Deore Rd-M5120 Rear Derailleur

Product ID: 463153454

Details

Brand
SHIMANO
Colour
Black
Item weight
203 Grams
Material
Aluminum
Mounting type
Braze-On Mount

📏SGS long cage fits up to 46T cassette

⚙️10/11-speed compatibility

🛡️Shadow RD+ clutch for chain stability

HK$740

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Description

🚵‍♂️ Shift Like a Pro, Ride Like a Legend

LOW PROFILE DURABILITY - Compact body reduces impact damage risk on rocky, technical trails—built to endure your toughest rides.
CHAIN SECURITY CHAMPION - Shadow RD+ clutch technology eliminates chain slap and drop, keeping your ride smooth and silent.
EXTENDED GEAR RANGE READY - SGS long cage design supports cassettes up to 46T, unlocking versatile terrain conquering power.
TRUSTED DEORE PERFORMANCE - Aluminum construction delivers reliable, consistent shifting that serious mountain bikers demand.
PRECISION SHIFTING MASTERY - Seamlessly shifts across 10 & 11-speed MTB drivetrains for ultimate trail control.

The Shimano Deore RD-M5120 Rear Derailleur is a high-performance 10/11-speed MTB component featuring Shadow RD+ clutch technology for chain stability, an SGS long cage accommodating up to 46T cassettes, and a low-profile design to minimize impact damage. Crafted from durable aluminum, it ensures precise, reliable shifting on demanding trail rides.

Specifications

ASIN	B089KDV5C7
Best Sellers Rank	#69,195 in Sporting Goods ( See Top 100 in Sporting Goods ) #39 in Bike Rear Dérailleurs
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.7 4.7 out of 5 stars (237)
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 Items	1
Number of Teeth	42
UPC	192790618548
Warranty Description	No Warranty

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HK$740

Duties & taxes included

In stock

Sold byAmazon Hong KongDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Hong Kong.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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2 weeks ago

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Excellent communication throughout the order process. Product is perfect.

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