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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Deore Rd-M5120 Rear Derailleur

Product ID: 434505662

Details

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

🔧Aluminum lightweight build

⚙️41t max capacity

🚵‍♂️2x11 & 1x10 speed compatible

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Description

🚵‍♂️ Shift Like a Pro, Ride Like a Legend

LOW PROFILE ARMOR - Sleek design minimizes damage risk from rocks and obstacles, so you stay trail-ready and worry-free.
LIGHTWEIGHT DURABILITY - Crafted from premium aluminum for a perfect balance of strength and weight savings.
CHAIN STABILITY MASTERY - Advanced clutch system virtually eliminates chain slap and drop, keeping your ride quiet and efficient.
WIDE GEAR COMPATIBILITY - Supports 2x11, 2x10, and 1x10 setups with up to 42t cassette range for versatile MTB performance.
ROCK SOLID SHIFTING PRECISION - SHIMANO SHADOW RD+ tech ensures smooth, reliable gear changes even on the roughest trails.

The Shimano Deore RD-M5120 Rear Derailleur combines lightweight aluminum construction with SHIMANO's Shadow RD+ clutch technology to deliver precise, quiet shifting across 10 and 11-speed MTB drivetrains. Designed for durability and chain stability, it supports up to 42t cassette ranges and features a low-profile design that protects against trail hazards, making it a top choice for serious mountain bikers seeking reliable performance.

Specifications

ASIN	B089KDV5C7
Best Sellers Rank	#48,170 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #14 in Rear Bike Derailleurs
Brand	SHIMANO
Brand Name	SHIMANO
Case Material Type	Aluminium
Color	Black
Customer Reviews	4.6 out of 5 stars 250 Reviews
Included Components	Rear Derailleur
Item Dimensions L x W x H	8"L x 5"W x 4"H
Item Highlight	Deore M5120 Rear Derailleur - 10/11-Speed MTB, Shadow RD+
Item Weight	203 g
Manufacturer	Shimano
Manufacturer Part Number	ERDM5120SGS
Material	Aluminum
Material Type	Aluminum
Model Number	Shimano
Mount Type	Braze-On Mount
Mounting Type	Braze-On Mount
Number of Items	1
Number of Teeth	42
Product Dimensions	8"L x 5"W x 4"H
UPC	192790618548
Unit Count	1 Count
Warranty Description	Limited Warranty

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$100.01

Duties & taxes included

In stock

Sold byAmazon British Virgin IslandsDelivered 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 British Virgin Islands.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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