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Ships within 48 hours · Estimated delivery Aug 13 - Aug 18
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Description
microSHIFT M21 Rear Derailleur - 6/7 Speed, Super Short Cage, BlackM21 rear derailleurs are designed to work with 6 and 7 speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs. Robust composite and steel construction Compatible with Shimano 6 and 7 speed mountain and road systems Product Specifics Largest Cog: 32 Rear Der Shifter Compatibility: Shimano Mountain Rear Der Shifter Compatibility: Shimano Road Rear Derailleur Mount Type: 10x1 Standard
M21 rear derailleurs are designed to work with 6- and 7-speed Shimano road and mountain shifters. Enjoy the wide variety of bikes you can get going again with M21 rear derailleurs.- Robust composite and steel construction
- Compatible with Shimano 6- and 7-speed mountain and road systems
Product Specifics
- Largest Cog: 32
- Rear Der/Shifter Compatibility: Shimano Mountain
- Rear Der/Shifter Compatibility: Shimano Road
- Rear Derailleur Mount Type: 10x1 Standard
- Drivetrain Speeds: 6
- Drivetrain Speeds: 7
- Chain Wrap Capacity (teeth): 21
- Cage Length: Short
- Color: Black
- Weight: 241
Today's Stock Status
10+ Available to ship in 2-4 Business Days
UPC: 708752522510
EAN: Not available
Manufacturer Part Number: RD-M21SS
RD0046
196226-Q0-L
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.0 ★★★★★
Based on 28 reviews
Sort
Product Reviews
★★★★★ 5
Good quality though
Size: 2AWG 15FT + 15FT, Color: Red + Black
Good though quality
Thick
Works good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 15, 2025
★★★★★ 5
Heavy-Duty 4 AWG Cable With Flexible Insulation
Size: 10ft, Color: 4awg
I am satisfied with this 4 AWG cable. The insulation coating is soft, and the cable itself is very pliable, making it easy to bend and route into the configuration needed for installation. Despite the flexibility, it still feels like a heavy-duty cable designed to handle demanding applications.
I am using this cable to provide the necessary amperage to start the generator on my trailer, and it performs as expected. I also like that the wire gauge and cable properties are clearly printed along the side of the insulation, making identification easy during installation or future maintenance.
The cable arrived in good condition with no obvious odor from the insulation or packaging. Overall, this appears to be a quality heavy-duty cable that is flexible, easy to work with, and suitable for high-current applications.
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Reviewed in the United States on May 8, 2026
★★★★★ 5
True copper battery cables that are high quality
Size: 10ft, Color: 4awg
I love having heavy duty cable on hand for my cars. It's so nice to be able to make your own starter and alternator cables when restoring cars.
These cables are 100% copper, not CCA (copper clad aluminum) like many others are. Copper is far superior for conductivity and handling higher loads.
The rubber on the cable is thick and yet very flexible..it's clearly marked and seems very durable. I like to use a hydraulic crimping tool and then add marine grade heat shrink tubing with the adhesive inside of it to keep it as weatherproof as possible.
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Reviewed in the United States on May 10, 2026
★★★★★ 5
Easy to work with
I bought this to wire up an airplane I built. I had to cut it into 10 separate pieces and crimp and solder lugs to each end. It was just the right length for what I needed and I'm very happy with the results.
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Reviewed in the United States on January 5, 2024
★★★★★ 5
Good product. I will buy again.
Great value. It did show up covered in small fiberglass particles which was a bit annoying.
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Reviewed in the United States on March 10, 2021
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