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

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
0.28 Kilograms
Material
Aluminum
Mounting type
Braze-On 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	Huazu
Brand Name	Huazu
Case Material Type	Aluminum
Color	Black
Colour	Black
Item Dimensions L x W x H	13L x 10W x 4H centimeters
Item Weight	0.28 Kilograms
Item weight	0.28 Kilograms
Manufacturer	Huazu
Manufacturer Part Number	RDTZ31A
Material	Aluminum
Material Type	Aluminum
Model Number	RDTZ31A
Mount Type	Direct Mount
Mounting type	Direct Mount
Number of Items	1
Number of Teeth	28
Product dimensions	13L x 10W x 4H centimeters
UPC	731235765869

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