Does it work with mongoose R4050WM 21 speed mountain bike?

I used it on my teens mongoose, unsure of the model, but I would think so?

Does it work for a 21 speed bike?

Yes, we used it for a 21 Speed Mongoose bike

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Fully operational. Shipping worldwide, on schedule.Duty & taxes paid at delivery

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Rear Derailleur, Huazu Bike Parts Gear Shifter for RD-TZ31-A with Direct Mount/Hanger Mount for 6/7 Speed Mountain Bicycles

Product ID: 451202909

Details

Brand
Huazu
Colour
Black
Item weight
227 g
Material
Aluminum
Mounting type
Direct Mount

🔩Direct mount design

⚙️6/7 speed compatibility

🛠️Durable aluminum alloy

Description

⚡ Shift into the fast lane with precision and durability!

UNIVERSAL COMPATIBILITY - Fits mountain, road, folding bikes, and tricycles—upgrade your ride regardless of style or terrain.
WIDE GEAR RANGE CAPACITY - Supports up to 34T total capacity with sprockets from 14T to 28T, perfect for varied terrain challenges.
ROBUST DIRECT MOUNT BUILD - Crafted with durable aluminum alloy and plastic for stable, reliable performance without hub bolt hassles.
SEAMLESS 6 7 SPEED SHIFTING - Optimized for GS 6/7 speed SIS Index drivetrains, ensuring smooth gear transitions on every ride.
HASSLE FREE INSTALLATION WARRANTY - Comes with supporting bolt, easy to install if you know your bike, plus a 12-month worry-free warranty.

The Huazu RD-TZ31-A Rear Derailleur is a direct mount, 6/7 speed compatible gear shifter designed for mountain, road, and folding bikes. Made from durable aluminum alloy, it offers stable and smooth shifting with a wide gear range capacity of up to 34T. Easy to install and backed by a 12-month warranty, it’s a reliable upgrade for riders seeking performance and versatility.

Specifications

ASIN	B09WRBHZNT
Brand Name	Huazu
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.3 4.3 out of 5 stars (525)
Item Dimensions L x W x H	13L x 10W x 4H centimeters
Item Weight	0.5 Pounds
Manufacturer	Huazu
Manufacturer Part Number	RDTZ31A
Material Type	Aluminum
Model Number	RDTZ31A
Mount Type	Direct Mount
Number of Items	1
Number of Teeth	28
UPC	731235765869

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