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: 476106412

Details

Brand
SHIMANO
Colour
black / black
Item weight
0.39 Kilograms
Material
Aluminum
Mounting type
Braze-On Mount

🔧SGS Long Cage, max 45T capacity

⚙️Double Servo tech for precision

🚴‍♂️7/8 speed drivetrain compatibility

€ 110.07

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Sold byAmazon CroatiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

LONG CAGE POWER - SGS Long Cage design handles up to 45 teeth, conquering tough terrain with ease.
TRUSTED PERFORMANCE - Shimano’s renowned engineering delivers reliable shifting, backed by 4.7-star user acclaim.
LIGHTWEIGHT DURABILITY - Crafted from aluminum for a perfect balance of strength and minimal weight (0.39 kg).
VERSATILE COMPATIBILITY - Seamlessly works with both 7 and 8-speed drivetrains for ultimate flexibility.
PRECISION SHIFTING MASTERY - Double Servo mechanism ensures ultra-smooth, accurate gear changes every ride.

The Shimano Acera RD-M3020-SGS Rear Derailleur features advanced Double Servo technology for smooth, precise shifting across 7 and 8-speed drivetrains. Its SGS Long Cage design supports a chain wrap capacity of 45 teeth, making it ideal for challenging terrains. Built with durable aluminum and weighing just 0.39 kg, this black derailleur combines lightweight strength with Shimano’s trusted performance, earning high user ratings and wide compatibility.

Specifications

ASIN	B0BGFBSYQ3
Best Sellers Rank	#118,464 in Sporting Goods ( See Top 100 in Sporting Goods ) #141 in Bike Shifters & Parts
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	black / black
Customer Reviews	4.7 4.7 out of 5 stars (190)
Included Components	Rear Derailleur
Item Weight	0.39 Kilograms
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

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€ 110.07

Duties & taxes included

In stock

Sold byAmazon CroatiaDelivered 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 Croatia.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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