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.

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

Product ID: 499632307

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Details

Brand
SHIMANO
Colour
Black
Manufacturer
SHIMANO
Material
Aluminium
Mounting type
Braze-On Mount

🔧SGS Long Cage, max 45T capacity

⚙️Double Servo tech for precision

🚴‍♂️7/8 speed drivetrain compatible

Description

⚙️ Shift Like a Pro, Ride Like a Legend

EXTENDED GEAR RANGE - SGS Long Cage design supports up to 45 teeth, giving you the freedom to tackle steep climbs and fast descents.
LIGHTWEIGHT DURABILITY - Crafted from premium aluminium, combining strength with minimal weight for peak performance.
SMOOTH SHIFTING MASTERY - Double Servo mechanism ensures ultra-precise gear changes, conquering any terrain with ease.
VERSATILE COMPATIBILITY - Seamlessly works with both 7 and 8-speed drivetrains, perfect for upgrading or maintaining your ride.
TRUSTED JAPANESE ENGINEERING - Shimano’s renowned quality and reliability, backed by thousands of 5-star reviews worldwide.

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 45-tooth chain wrap capacity, ideal for versatile riding conditions. Made from durable aluminium and engineered in Japan, it offers reliable performance for cyclists seeking quality and value.

Specifications

ASIN	B0BGFBSYQ3
Best Sellers Rank	51,689 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) 54 in Bike Rear Dérailleurs
Brand	SHIMANO
Brand Name	SHIMANO
Case Material Type	Aluminium
Colour	Black
Country Of Origin	Japan
Customer Reviews	4.7 out of 5 stars 170 Reviews
Included Components	Rear Derailleur
Manufacturer	SHIMANO
Manufacturer Part Number	ERDM30208SGSL
Material	Aluminium
Material Type	Aluminium
Model Number	ERDM30208SGSL
Mount Type	Braze-On Mount
Mounting type	Braze-On Mount
Number of Teeth	45
UPC	192790897738

Reviews

J**7

Calidad

16.02.2025

J**F

Nice derailleur for reasonable price

14.07.2025

A**A

hat sie gepasst auf meiner Cube, läuft gut

Schaltwerk fahrad

6.07.2025

J**S

Good quality

24.06.2025

R**Y

25 year old Mikado road bike and gravel bike shifts smoother and firmer than when new

24.09.2025

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