Description
The Shimano Acera RD-M3020 7/8-Speed Rear Derailleur offers light shifting operation and over-sized pulleys for a wider gear choice; compatible with 7- and 8-speed drivetrains.
Features:
- Double Servo construction for smooth and precise shifting
- Versatile performance and wide compatibility
- Low sprocket: 30-40T
- High sprocket: 11-12T
- Total capacity: 45T
B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.
Reviews
Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
This derailer works perfect.
by Lance
Casual Cyclist
Sunriver Or
I changed my cassette to more of a hill climbing gear range. Had to change out the derailer, this is the only one I could find for a seven speed. It works perfect, shifts great.
Reviewed 10/30/2024
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shift smooth for lectric bike
by Jody
Cycling Enthusiast
Ohio
1 of 1 customers found this review helpful.
I bought this after the on on my lectric bike failed. such a big difference i shifting and so smooth for the price.
Reviewed 1/19/2023
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One of the most used 7-8 speed derailleurs
by KC cyclist
Cycling Enthusiast
Kansas City area
3 of 3 customers found this review helpful.
Better than the entry level Shimano derailleurs and performs well. Quite durable, especially for the price. Typically used on $450-600 bikes and many e-bikes costing much more. Been around for a long time.
Reviewed 8/6/2019
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Went on very easily and adjusted quickly.
by Mick
Cycling Enthusiast
Huntsville, AL
3 of 3 customers found this review helpful.
The tech I spoke with was very knowledgeable and helpful. He spoke bicycle. Tech made useful suggestions about the product to buy and best order to swap out parts.
Reviewed 6/21/2018
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