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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⚙️ Shift into the future of smooth rides — don’t get left behind!

EFFORTLESS UPGRADE - Plug-and-play rear derailleur that fits a broad range of bikes, making your ride smoother instantly.
LIGHTWEIGHT DURABILITY - Crafted from robust aluminium, balancing strength and minimal weight at just 381 grams.
EXTENDED CHAIN CAPACITY - SGS Long Cage design supports up to 45 teeth, perfect for versatile riding styles and steep climbs.
SMOOTH SHIFTING MASTERY - Double Servo mechanism ensures ultra-precise gear changes, conquering any terrain with ease.
WIDE SPEED COMPATIBILITY - Seamlessly works with both 7 and 8-speed drivetrains, maximizing your bike’s performance range.

The Shimano Acera RD-M3020-SGS Rear Derailleur features advanced Double Servo technology for precise shifting, a long cage design supporting up to 45 teeth chain wrap, and compatibility with 7 and 8-speed drivetrains. Made from durable aluminium and weighing only 381 grams, it offers a reliable, lightweight upgrade for versatile cycling performance.

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1272 DH

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Trustpilot

TrustScore 4.5 | 7,300+ reviews

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

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UPC	192790897738
Color	Black
Size	SGS Long Cage
Material type	Aluminium
Number of items	1
Included components	Rear Derailleur
Batteries included?	No
Department	Rear Derailleur
Item model number	ERDM30208SGSL
Product Dimensions	17.81 x 2.13 x 10.31 cm; 381 g
ASIN	B0BGFBSYQ3

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

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