


Shimano - ACERA Rear Derailleur RD-M3020-8 8/7-speed
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Shimano - ACERA Rear Derailleur RD-M3020-8 8/7-speedDouble Servo construction for smooth and precise shifting Versatile performance and wide compatibility Max. low sprocket: 40T Total capacity: 45T Product Description The SHIMANO ACERA M3020 8 rear derailleur with Double Servo technology helps you ride challenging terrain with fewer interruptions. Product Specifications Rear Speed 7 8 Speed Average weight Color Black Pulley cage SGS Rear speeds 8 Low sprocket Min. 30T Low sprocket Max. 40T Rear speeds
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Your Shimano - ACERA Rear Derailleur RD-M3020-8 8/7-speed orders ship within 1-2 business days.
Delivery Options:
- Standard: 3-7 business days
- Fast: 2-3 business days
- Express: 1-2 business days
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You'll receive a tracking link by email once your Shimano - ACERA Rear Derailleur RD-M3020-8 8/7-speed ships.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
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★★★★★ 5
Perfect fit
Color: Black+Smiley Face
Nice
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Reviewed in the United States on May 14, 2026
★★★★★ 3
Suction cups aren’t the best
Color: Black+Smiley Face
The suction cups don’t hold and my smiley sponge isn’t snug on the post so it sometimes falls off.
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Reviewed in the United States on January 16, 2026
★★★★★ 5
Sticks and stays in place!!
Color: Black+Smiley Face
Love love loveeee this! Took me a while to find one that actually sticks and stays in place.
I've had mine for a few months now. Looks just like the photos & comes with the suction cups and an adhesive strip if you want a firmer hold.
The suction cups work just fine.
Would recommend 👍🏾😁
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Reviewed in the United States on August 4, 2025
★★★★★ 5
Well made solid shelves
Size: 42 inch 2 Tier
Look exactly like picture. Very well made and easy to assemble!
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Reviewed in the United States on May 3, 2026
★★★★★ 5
Very easy to put up and assemble!
Size: 48 inch 3 Tier, Size: 48 inch 3 Tier
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