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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ACERA Rear DERAIL 7/8-SPEED Long CAGE Black

Product ID: 481941776

Details

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

🔧SGS Long Cage for max chain wrap

⚙️Double Servo tech for precision

🚴‍♂️7/8-speed drivetrain compatibility

240.18 DT

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In stock

Sold byAmazon TunisiaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚙️ Shift into the future of smooth rides — precision that keeps you ahead!

LIGHTWEIGHT DURABILITY - Crafted from robust aluminum, balancing strength with a featherlight 0.39 kg frame for agile performance.
ULTIMATE CHAIN CONTROL - SGS Long Cage design handles up to 45 teeth, giving you seamless chain wrap capacity for varied terrain.
SMOOTH SHIFTING MASTERY - Double Servo mechanism ensures ultra-precise gear changes, so you never miss a beat on your ride.
TRUSTED SHIMANO QUALITY - Backed by a 2-year warranty and a 4.7-star rating from 189 riders, join the community that demands reliability.
VERSATILE SPEED COMPATIBILITY - Optimized for both 7 and 8-speed drivetrains, making upgrades and replacements hassle-free.

The Shimano ACERA RD-M3020 rear derailleur features advanced Double Servo technology for precise shifting, an SGS Long Cage for up to 45 teeth chain wrap capacity, and compatibility with 7 and 8-speed drivetrains. Made from durable aluminum and weighing just 0.39 kg, it offers reliable performance backed by Shimano’s trusted 2-year warranty and strong user acclaim.

Specifications

ASIN	B0BGFBSYQ3
Best Sellers Rank	#73,500 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #29 in Rear Bike Derailleurs
Brand	SHIMANO
Brand Name	SHIMANO
Case Material Type	Aluminum
Color	Black
Customer Reviews	4.7 out of 5 stars 189 Reviews
Included Components	Rear Derailleur
Item Weight	0.39 Kilograms
Manufacturer	Shimano
Manufacturer Part Number	ERDM30208SGSL
Material	Aluminum
Material Type	Aluminum
Model Number	ERDM30208SGSL
Mount Type	Braze-On Mount
Mounting Type	Braze-On Mount
Number of Teeth	45
UPC	192790897738
Warranty Description	2 years

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240.18 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Rajesh P.

Customer service was outstanding when I had questions about the product.

2 days ago

Abdullah B.

Great price for an authentic product. Fast international shipping too!

3 weeks ago

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