M21 rear derailleurs are designed to work with 6- and 7-speed 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 6- and 7-speed mountain and road systems. Item Specifications: Cage Length, Short, Chain Wrap Capacity (teeth), 39, Color, Black, Drivetrain Speeds, 7, Rear Der/Shifter Compatibility, Mountain, Rear Derailleur Mount Type, Dropout Claw Hanger,

MicroSHIFT M21 6/7-Speed Short Cage Rear Derailleur for Mountain & Road Bikes

Reference Number: 3CC6CO

Upgrade your cycling setup with the microSHIFT M21 Rear Derailleur - the perfect solution for versatile 6- and 7-speed mountain and road bikes. Crafted for durability and performance, this rear derailleur features a robust combination of composite and steel construction, ensuring reliable shifting in demanding riding conditions.

Designed with precision engineering, the M21 derailleur is compatible with 6- and 7-speed mountain and road shifters, making it a flexible choice for a wide range of bicycles. Its short cage design offers excellent chain wrap capacity of 39 teeth, enabling smooth gear transitions across a wide gear range. The derailleur's maximum cog size of 30 teeth allows you to dial in your optimal gear ratio for climbing or cruising.

Built with a dropout claw hanger mount, the M21 derailleur provides easy installation and compatibility with various dropout standards. Its sleek black finish adds a professional look to your bike while ensuring longevity and resistance to the elements.

Whether you're upgrading an existing bike or building a custom ride, the microSHIFT M21 Rear Derailleur delivers precise, dependable shifting for mountain biking, commuting, or recreational riding. Maximize your bike's performance with this affordable, high-quality component that combines innovative technology with durable materials for outstanding cycling experience.

  • Reliable Compatibility with 6- and 7-Speed Shifters ensures seamless gear shifting on both road and mountain bikes, enhancing versatility and performance.
  • Constructed from durable composite and steel materials, this rear derailleur offers robust performance and long-lasting durability for demanding riding conditions.
  • Features a short cage design optimized for precise and responsive shifting across a wide gear range, accommodating up to a 30-tooth largest cog for versatile gearing options.
  • Designed with a dropout claw hanger mounting system, allowing easy installation and compatibility with a variety of bike frames for quick and secure setup.
  • Ideal for mountain and road cycling enthusiasts seeking an affordable, high-performance derailleur with modern engineering, proven technology, and sleek black style.
Item Specifications
Largest Cog30
Rear Der/Shifter Compatibility Mountain
Rear Derailleur Mount TypeDropout Claw Hanger
Drivetrain Speeds6
Drivetrain Speeds7
Chain Wrap Capacity (teeth)39
Cage LengthShort
ColorBlack

Why 365 Cycles?

365 Cycles is an Authorized microSHIFT Dealer, and we offer the Full microSHIFT Warranty!

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365 Cycles delivers all your cycling needs fast! We don't waste time preparing your order. Our priority is to serve our customers first and foremost. If you need help picking the right product, have questions about bike component compatibility, or just want to geek out about bikes we are here 7 days a week! Simply put, we are bike experts from dirt to tarmac and want to make sure you get the full 365 Cycles experience when you shop with us.

At 365 Cycles our mission is to simplify the shopping experience. We want to get you the right product in a quick time frame and be here if you need help with questions, warranty, friend to talk to, etc.

We’re dedicated to building lasting relationships with our customers, communities, and team members. We combine the knowledge and service of a traditional bicycle shop with the convenience of shopping in your own home.





Shipping & Handling

Most orders placed during the workweek before 1:30 pm EST ship the same day, but in rare cases (peak season/holiday periods) handling time can take up to 48 hours. If you have questions regarding shipping estimates, please let us know prior to placing your order. There is a direct signature requirement for all orders over $500.

Please allow 1-2 business days for your order tracking to update.

  • Cut off for SAME DAY SHIPPING- 1:30 pm EST Monday - Friday
  • Friday afternoon -Sunday orders ship the following Monday
  • Due to carrier restrictions orders shipped to: PO Box, HI, AK, & PR 365 Cycles may use a comparable service to what was selected.

Combined Shipping Discounts

To offer customers savings on shipping, we offer discounts when shipping multiple items from our store. We cannot issue refunds on shipping once an order is finalized so please follow the 5 steps below and ask if you are having trouble with the discount before you make a purchase.

  1. Be sure you are using the US site: https://www.ebay.com
  2. Select Add to Cart (instead of Buy It Now) with items from our store 365Cycles
  3. Click on Proceed to Checkout. On the checkout page, the shipping service on each line item needs to match
  4. Compare First Class vs Priority as sometimes Priority can be cheaper and it gets to you faster!
  5. You’ll need to change the shipping method to Priority on every item in your cart before the rate can be calculated.

Returns

365 Cycles offers returns for 30 days on new items in their original, intact packaging. Return shipping for ALL orders are to be paid by the buyer. Please be sure to read our return policy entirely and if you have any questions, please contact Customer Service.

Full refunds are issued on items that are brand new and we are able to resell as new. 365 Cycles reserves the right to deny returns that are outside of policy including, but not limited to, used items, items missing original packaging, items with damaged manufacturer packaging, or international orders. Return orders must be shipped in a box or bubble mailer. Items shipped without an outer box will incur a restocking fee. You will be contacted through eBay if your return is ineligible for a full refund.

Returns must be initiated within 30 days from purchase date through your Purchase History under My eBay.

If we make an error in shipping, please contact us -- we will ship out the correct item and provide a free prepaid return label as quickly as possible!

Exchanges

If you need to exchange your order, the fastest and easiest way to do this is to reorder. We will ship your new order immediately and, in the meantime, please initiate a return through eBay on the original item and return it. We will refund for the returned item once it is received back.



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Company Details

365 Cycles
1180 Enterprise Rd
East Petersburg, PA 17520
United States

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