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

Secure Transaction

Details

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

🔧SGS Long Cage for max chain wrap

⚙️Double Servo tech for precision

🚴‍♂️7/8 speed compatibility

Description

⚙️ Shift into the future with Shimano’s precision power!

LONG CAGE POWER - SGS Long Cage design handles up to 45 teeth chain wrap capacity, ideal for tackling varied terrain with confidence.
WIDE COMPATIBILITY - Works flawlessly with 1x, 2x, or 3x front derailleurs, giving you the freedom to optimize your drivetrain.
DURABLE LIGHTWEIGHT - Crafted from premium aluminium, combining strength with a featherlight 390g build for peak performance.
SMOOTH SHIFTING MASTERY - Double Servo mechanism ensures ultra-precise gear changes, so you never miss a beat on your ride.
VERSATILE SPEED COMPATIBILITY - Seamlessly supports 7 and 8-speed drivetrains, perfect for upgrading or customizing your bike setup.

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 high chain wrap capacity of 45 teeth, making it ideal for diverse riding conditions. Built from durable aluminium and weighing just 390g, it offers versatile compatibility with multiple front derailleur setups, ensuring reliable performance for both casual and challenging rides.

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

Common Questions

Are the products genuine and authentic?+

Yes, all products are sourced directly from authorized retailers in the US, UK, UAE and India. We maintain strict quality control processes and verify each product before shipping. All items come with applicable manufacturer warranties and are covered by our standard return policy.

How long does delivery take and is it reliable?+

Delivery times vary by destination country, typically ranging from 3-9 business days. Each order is fully trackable through our system. We handle all customs clearance and use reliable courier partners for last-mile delivery. You'll receive regular updates about your order status via email and our app.

What is Desertcart? Is it safe to order from?+

Desertcart is an international e-commerce platform operating since 2014. We securely process thousands of orders globally each day. Every product goes through our quality verification process before delivery, and we provide end-to-end order tracking, 24/7 customer support, and a comprehensive returns policy to ensure a safe shopping experience.

How is product pricing calculated?+

Our prices include the product cost, international shipping, import duties, customs clearance, and local delivery charges. We handle all customs and import procedures, ensuring there are no hidden fees upon delivery. PRO members receive additional benefits including free shipping.

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Anita G.

Good experience, but the tracking updates could be better.

2 months ago

Yusuf A.

Fantastic experience overall. Will recommend to friends and family.

1 month ago

View all Trustpilot reviews

Shop Global, Save with Desertcart

Value for Money

Competitive prices on a vast range of products

Shop Globally

Serving millions of shoppers across more than 100 countries

Enhanced Protection

Trusted payment options loved by worldwide shoppers

Customer Assurance

Trusted payment options loved by worldwide shoppers.

Desertcart App

Shop on the go, anytime, anywhere.

$622783

Duties & taxes incl.

Colombiastore

Free Returns

30 daysfor PRO membership users

15 dayswithout membership

Secure Transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Abdullah B.

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

3 weeks ago

Fatima A.

Best international shipping I've ever tried. Worth every penny!

3 days ago

View all Trustpilot reviews