SHIMANO ACERA RD-M3020-8 SGS Rear Derailleur 7/8-Speed Black

The SHIMANO ACERA RD-M3020-8 SGS Rear Derailleur is designed to deliver smooth, stable, and reliable shifting performance for mountain bikes, trekking bikes, and everyday cycling setups. Built with Shimano’s trusted Double Servo construction, this rear derailleur ensures precise gear changes even on rough and challenging terrain. Its wide-range compatibility supports 7 and 8-speed drivetrains, making it a versatile choice for riders looking to upgrade or replace their current derailleur. The SGS long cage design provides better chain management and supports larger cassette sizes for improved climbing ability and riding comfort. With a strong direct attachment system and quick assembly design, installation becomes simple and secure. Whether you ride trails, commute daily, or enjoy long-distance touring, the Shimano ACERA RD-M3020-8 offers dependable shifting efficiency and long-lasting durability for consistent riding performance.

Key Features

• Double Servo Technology: Smooth and precise shifting performance across different terrains

• Speed Compatibility: Supports both 7-speed and 8-speed drivetrains

• Wide-Range Cassette Support: Compatible with large sprockets up to 40T

• SGS Long Cage Design: Improved chain stability and wider gear capacity

• Direct Attachment Mount: Secure fitting with easy installation setup

• Quick Assembly Design: Simple mounting process for convenient maintenance

• Durable Construction: Built for long-lasting daily riding performance

• Allen Key Cable Fixing Bolt: Easy and secure cable adjustment system

Product Specifications

• Brand: Shimano

• Series: ACERA

• Model: RD-M3020-8

• Speed Compatibility: 7/8-Speed

• Cage Type: SGS Long Cage

• Mount Type: Direct Attachment

• Color: Black

• Maximum Large Sprocket: 40T

• Total Capacity: 45T

• Cable Fixing Type: Allen Key Bolt

• Technology: Double Servo Construction

• Packaging: Industrial Pack

Shifting Performance & Compatibility

The Shimano ACERA RD-M3020-8 is engineered for riders who need stable and efficient shifting with wide-range drivetrain compatibility. Its SGS long cage design works exceptionally well with larger cassette setups, helping riders tackle steep climbs and uneven terrain more confidently. The derailleur maintains smooth chain movement and accurate shifting performance during commuting, touring, and off-road riding. Shimano’s Double Servo construction improves overall drivetrain efficiency by reducing unnecessary chain movement and enhancing gear transition stability.

Easy Operation / Usage

• Install directly onto compatible derailleur hanger mounts

• Connect the gear cable using the Allen key fixing bolt

• Adjust limit screws and indexing for precise shifting

• Compatible with Shimano 7-speed and 8-speed systems

• Ideal for MTB, trekking, hybrid, and touring bicycles

Why Choose This Product

• Trusted Shimano ACERA performance and reliability

• Smooth gear transitions for comfortable riding

• Supports wide-range cassette combinations

• Durable design suitable for regular use

• Easy installation and maintenance process

• Great option for MTB and touring bike upgrades

• Consistent shifting performance on rough terrain

In the Box

• 1 x SHIMANO ACERA RD-M3020-8 Rear Derailleur