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: 434505662

Details

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

⚙️41t max capacity

🛠️Aluminum durability

🚵‍♂️SHADOW RD+ low profile

€ 95.86

Duties & taxes included

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Sold byAmazon BelgiumDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚵‍♂️ Shift Like a Pro, Conquer Every Trail

ROCK SMART DESIGN - Low-profile SHADOW RD+ keeps your derailleur safe from trail hazards.
PRECISION SHIFTING - Smooth, consistent gear changes across 10-11 speed cassettes for ultimate control.
CHAIN STABILITY TECH - Advanced chain stabilizer reduces drops and drivetrain noise—ride quietly, ride confidently.
LIGHTWEIGHT STRENGTH - Durable aluminum build at just 203g balances toughness with nimble performance.
WIDE GEAR COMPATIBILITY - Supports 2x11, 2x10, and 1x10 setups with up to 46t cassette range for versatile trail mastery.

The Shimano Deore RD-M5120 Rear Derailleur features a rugged aluminum construction and SHIMANO's SHADOW RD+ low-profile design to protect against trail damage. It supports a wide gear range (up to 46t cassette) compatible with 10 and 11-speed drivetrains, delivering smooth, quiet, and reliable shifting performance for serious mountain bikers.

Specifications

ASIN	B089KDV5C7
Best Sellers Rank	#44,077 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #16 in Rear Bike Derailleurs
Brand	SHIMANO
Brand Name	SHIMANO
Case Material Type	Aluminium
Color	Black
Customer Reviews	4.6 out of 5 stars 227 Reviews
Included Components	Rear Derailleur
Item Dimensions L x W x H	8"L x 5"W x 4"H
Item Weight	203 Grams
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 Teeth	42
Product Dimensions	8"L x 5"W x 4"H
UPC	192790618548
Unit Count	1.0 Count
Warranty Description	Limited Warranty

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