Shimano Acera RD-M3020-8 - ERDM30208SGSL - 7/8-speed direct mount rear derailleur, SGS cage, 40-tooth large cog

Shimano Acera RD-M3020-8 7/8 speed rear derailleur

The Shimano Acera RD-M3020-8 rear derailleur is designed for Shimano 7 and 8-speed drivetrains. With its SGS cage, direct mount, and compatibility with HG 8, 7, and 6-speed chains, it offers a reliable solution for bikes equipped with a versatile drivetrain.

Thanks to its Double Servo construction, the Shimano Acera RD-M3020-8 - ERDM30208SGSL rear derailleur ensures smooth and precise gear changes, even on challenging terrain. It allows you to maintain a consistent pace and minimize cadence drops during technical or hilly sections.

With a maximum sprocket size of 40 teeth and a total capacity of 45 teeth, this Shimano Acera rear derailleur allows for a wide range of gears. It is suitable for mountain bikes, hybrid bikes, trekking bikes, or all-rounders equipped with a compatible 7- or 8-speed Shimano drivetrain.

Design

Direct attachment

The Shimano Acera RD-M3020-8 derailleur uses a direct mount, suitable for frames compatible with this type of mounting.

SGS screed

The SGS cage allows for a greater chain length and accepts a wider range of gear ratios on compatible transmissions.

Double Servo Construction

The Double Servo construction allows for smooth and precise gear changes, with operation adapted to varied terrains.

Integrated cable adjuster

The integrated cable adjuster allows you to adjust the cable tension to optimize gear shifting after installation.

Black finish

The black finish offers a simple and discreet look, easy to integrate on different types of bikes.

Performance

Smooth gear changes

The Double Servo technology contributes to smoother and more precise gear changes, to maintain a consistent transmission.

Fewer breaks in rhythm

The Shimano Acera M3020-8 rear derailleur helps ride on difficult terrain with fewer breaks in rhythm, maintaining efficient gear control.

Wide compatibility

With its 7 and 8 speed compatibility, this model fits many Shimano transmissions equipped with compatible HG chains.

Large sprocket up to 40 teeth

The RD-M3020-8 accepts a small sprocket up to 40 teeth, allowing for a wider range of gears for climbs and challenging terrain.

Total capacity of 45 teeth

The total capacity of 45 teeth allows the derailleur to efficiently handle the difference in sprocket sizes on compatible drivetrains.

Compatibility

7/8 speed transmission

The Shimano Acera RD-M3020-8 derailleur is compatible with Shimano 7 and 8 speed rear drivetrains.

Shimano HG chains

It is compatible with Shimano HG 8, 7 and 6 speed chains.

Compatible sprockets

The derailleur accepts a top sprocket of 11 to 12 teeth and a small sprocket of 30 to 40 teeth, depending on the transmission configuration.

Direct mounting

This model is designed for direct mounting onto a compatible frame.

Technical specifications

• Brand: Shimano
• Range: Acera
• Model: RD-M3020-8
• Shimano part number: ERDM30208SGSL
• EAN code: 4550170897734
• UPC Code: 192790897738
• Product family: rear derailleur
• Reverse speeds: 8 / 7 speeds
• Type: direct fixing / direct attachment
• Screed: SGS
• Color: black
• Packaging: individual packaging
• Compatible chain: HG 8 / 7 / 6 speed
• Roller: 11 teeth
• Cable adjuster: yes
• Minimum upper sprocket: 11 teeth
• Maximum upper sprocket: 12 teeth
• Smallest sprocket: 30 teeth
• Smallest sprocket max.: 40 teeth
• Maximum front difference: 20 teeth
• Total capacity: 45 teeth
• Construction: Double Servo

Recommended use

• Replacing a Shimano 7 or 8 speed rear derailleur
• Compatible Shimano Acera drivetrain
• Recreational mountain biking
• VTC
• Trekking bike
• Versatile bicycle equipped with a compatible Shimano drivetrain
• Assembly requiring an SGS screed
• Transmission with large sprocket up to 40 teeth
• Assembly with Shimano HG 6/7/8 speed chain compatible

Why choose the Shimano Acera RD-M3020-8 rear derailleur?

• Shimano Acera 7/8 speed rear derailleur
• Dual Servo construction for smooth and precise gear changes
• Compatible with a large sprocket up to 40 teeth
• Total capacity of 45 teeth
• SGS screed for an extended range of developments
• Direct attachment
• Compatible with HG 8, 7 and 6 speed chains
• Integrated cable adjuster
• Discreet black finish
• Suitable for difficult terrain and versatile uses
• A reliable solution for replacing a worn rear derailleur.
• Genuine Shimano product
• Reference ERDM30208SGSL