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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🚵‍♂️ Shift Like a Pro, Ride Like You Own the Trail

VERSATILE GEAR MASTERY - Supports 1×10 and 2× drivetrains with up to 46T sprockets for ultimate trail adaptability.
TRAIL PROOF COMPACTNESS - Low-profile design minimizes damage from rocks and trail impacts—ride harder, worry less.
SILENT SHIFTS ZERO SLAP - SHADOW RD+ tech keeps your chain locked and noise-free for smooth, confident rides.
PRECISION IN EVERY TERRAIN - Consistent, reliable shifting performance no matter how rugged the trail gets.
BUILT TO LAST BUILT FOR SPEED - Lightweight aluminum construction balances durability with high-performance cycling.

The SHIMANO Deore RD-M5120 Rear Derailleur features SHADOW RD+ technology for chain stability and noise reduction, a low-profile design to resist trail damage, and a long SGS cage supporting up to 46T sprockets. Compatible with 10 and 11-speed drivetrains, it delivers consistent, reliable shifting performance across rugged terrains, all housed in a durable yet lightweight aluminum frame.

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Mounting type	Braze-On Mount
Number of teeth	42
Product dimensions	20.3L x 12.7W x 10.2H centimeters
Manufacturer	Shimano Inc.
UPC	192790618548
Age Range	Adult
Color	Black
Size	Standard
Weight	1 Pounds
Material Type	Aluminum
Number of Items	1
Sport	Cycling
Included Components	1 x Shimano Deore RD-M5120-SGS 10/11 Speed Rear Derailleur, Black
Batteries Included?	No
Department	mens
Item model number	Shimano
ASIN	B089KDV5C7

Shimano Deore Rd-M5120 Rear Derailleur

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