Will this replace stx rc?

Yes it will as long as your low sprocket on your cassette is as least a 30t. There are cheaper Shimano derailleurs that will also work. What makes this one special is it can be used on a 1x setup with a 11-40T cassette.

Will this replace an sis megarange?

A highly qualified "Yes". Be prepared to become a self-taught expert in bicycle derailleurs in the process. Expect to discover that you need other parts, such as a hanger-adapter. You will almost certainly need to replace your shifter cable and housing, as the cable entry is different, necessitating rerouting, and hence a different length cable and housing.

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Shimano Acera RD-M3020-SGS Rear Derailleur - 7/8 Speed, Long Cage, Black

Product ID: 481941776

Details

Brand
SHIMANO
Color
Black
Item Weight
0.39 kg
Material
Aluminum
Mounting Type
Braze-On Mount

🔧7/8 speed drivetrain compatibility

🦾Long cage with 45T chain wrap capacity

⚙️Double Servo tech for precision

R1746

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Description

⚙️ Shift like a pro, ride like you own the trail!

ULTIMATE VERSATILITY - Compatible with both 7 and 8-speed drivetrains for flexible upgrades and repairs.
LIGHTWEIGHT DURABILITY - Crafted from aluminum for a sleek, strong, and corrosion-resistant build.
EXTENDED CHAIN CAPACITY - Long cage design handles up to 45 teeth, perfect for wide gear ranges and rugged rides.
TRUSTED SHIMANO QUALITY - Backed by a 2-year warranty and top-rated by thousands of cyclists worldwide.
SEAMLESS SHIFTING MASTERY - Double Servo mechanism ensures ultra-smooth, precise gear changes on any terrain.

The Shimano Acera RD-M3020-SGS Rear Derailleur features advanced Double Servo technology for smooth, precise shifting across 7 and 8-speed drivetrains. Its long cage design supports a 45-tooth chain wrap capacity, making it ideal for versatile, rugged cycling. Built from durable aluminum and backed by Shimano’s trusted 2-year warranty, this derailleur is a reliable upgrade for serious riders seeking performance and longevity.

Specifications

ASIN	B0BGFBSYQ3
Best Sellers Rank	#77,331 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #33 in Rear Bike Derailleurs
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.6 4.6 out of 5 stars (194)
Included Components	Rear Derailleur
Item Weight	0.39 kg
Manufacturer	Shimano
Manufacturer Part Number	ERDM30208SGSL
Material Type	Aluminum
Model Number	ERDM30208SGSL
Mount Type	Braze-On Mount
Number of Items	1
Number of Teeth	45
UPC	192790897738
Warranty Description	2 years

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R1746

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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