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SKU: RD6401

Shimano ZEE RD-M640-SS Rear Derailleur - 10 Speed, Short Cage, With Clutch

Vendor Shimano
Regular price $72.72
Sale price $72.72 Regular price $100.95
Sale Sold out
Unit price
/per 
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Manufacturer Warranty

This is a pre order item. We will ship it when it comes in stock.
Description
Shimano ZEE RD-M640 Rear Derailleurs
  • Shadow Plus technology proven to reduce chain slap, drop and impact noise and the 10-speed short cage rear derailleur's low-profile tucks safely below the cassette cogs
  • FR spec designed for use with wide-range cassettes; up to 36t max cog
Specifications

ColorGray
Weight250
Largest Cog36
Chain Wrap Capacity25
Cage LengthShort
Drivetrain Speeds10
Rear Der/Shifter CompatibilityShimano Mountain
Rear Derailleur Mount Type10x1 Standard
Rear Derailleur Mount TypeShimano Rear Direct Mount

We pride ourselves on our ability to ship and deliver your gear with excessive speed! We ship from 22 locations throughout the United States and most orders will arrive in 3 days or less with Free Shipping!

The nitty gritty, for specific delivery timelines please pay attention to the delivery timelines on the product pages and the time frame estimated in the carts. If you need a part by a specific day, please contact us by chat, phone, or email.

  • Chat: Click the bubble on the bottom right side of the screen
  • Email: [email protected] or click contact us in the header to fill out a form
  • Phone: 603-968-5797

Most orders placed during the workweek before 1:00 PM Eastern time ship the same day, but during peak/holiday season or depending on inventory location handling time can take up to 48 hours. If you have questions regarding shipping estimates, don't hesitate to get in touch with us before placing the order. There is a direct signature requirement for all orders over $500.

We provide the you the ability to utilize multiple shipping & billing addresses, based upon what fits your current needs. However you are responsible to maintain and update any new address changes, as 365 Cycles will not be held liable for orders being shipped to an incorrect address.

      • Our Mistake: If we messed it up you can rest assured we are going to make it right. Contact us by email, phone, or chat and we will make your head spin with how quick we fix it
      • Warranty: We are an authorized retailer for everything we sell, so rest assured your product is covered under the manufacturer's warranty. Contact Us if you are having an issue and we will make sure you are taken care of
      • Just don't want it anymore: We have a 30-day return policy for orders within the US. We offer refunds on returned items that are brand new and in their undamaged, original packaging. Customers are responsible for the cost of return shipping. Damaged, installed, and used items as well as those without original packaging are not eligible for returns. If it's returned in this condition it may be denied and sent back to you

      If you need to return your order please email us at [email protected], call us at 603-968-5797, or use the live chat on our site.


      *Please allow up to 3 business days for us to process your return*

      365 Cycles puts the customer above everything. Our number one goal is your satisfaction. When you press the shift lever you want the gears to shift, and when you buy bicycle parts, you want the bicycle parts to arrive on time in new condition. With over 60,000 products and 22 warehouse locations throughout the country, we have the parts you need and they are coming in hot!

      Living an active lifestyle is just that, a lifestyle that never goes away and our goal is to always exceed your expectations so we can take this lifelong journey together. We strive to have the parts you need, at competitive prices with unmatched shipping speeds! 

      If there is ever an issue with an order we will work at warp speed to fix our mistake and make sure you never go a day without a bicycle! If you are not receiving the quality of service you need from one of our exceptionally qualified bicycle experts, tell them Ben Berman told you to tell them "Customer Loyalty" and then name your terms. 

      Our team is waiting to help you 7 days a week and they are more qualified to help than I am but if you ever feel like you're not getting the service you need I’m personally asking you to email me at [email protected] with "CUSTOMER LOYALTY" in the title and I will personally handle your order. 

      Over the years we have served millions of satisfied customers and continue to serve many of them today. With your feedback, we are confident we can take this lifelong journey together and build a friendship that goes beyond parts and accessories.

      If you want to go fast, go alone, if you want to go far, go together.” -Someone Smart

      Ben Berman Founder & CEO of 365 Cycles

      Company Core Values: 

      These were established by the members of our team and we use them every week to call out team members who have shined in one of these areas. Feel free to let us know at [email protected] if someone you worked with has gone above and beyond in one of these areas. 

      Customer Dedication: Put yourself in their shoes and support those who support us.
      You Control the Outcome: "If it is to be, it’s up to me" You are personally responsible for controlling the outcome.
      Seek Understanding: It's easier to complain than it is to understand, avoid the easy route.
      Progress Not Perfection: Pick a direction, analyze the results, and be willing to change course.
      Will to Win: Customers, 365 Team, and Partners, all need the will to win. If they don't have that will, it's our job to give it to them.
      Keep Moving: Move the body, move the mind, and remove any hurdles to achieving an active lifestyle.
      Do the Right Thing: Doing the right thing is more important than doing the thing right.
      Stronger together: If you want to go fast, go alone, if you want to go far, go together. Get your team involved and become stronger together.

      Selected page contains no content. Add content to this page in the page editor.

      Shipping

      We pride ourselves on our ability to ship and deliver your gear with excessive speed! We ship from 22 locations throughout the United States and most orders will arrive in 3 days or less with Free Shipping!

      The nitty gritty, for specific delivery timelines please pay attention to the delivery timelines on the product pages and the time frame estimated in the carts. If you need a part by a specific day, please contact us by chat, phone, or email.

      • Chat: Click the bubble on the bottom right side of the screen
      • Email: [email protected] or click contact us in the header to fill out a form
      • Phone: 603-968-5797

      Most orders placed during the workweek before 1:00 PM Eastern time ship the same day, but during peak/holiday season or depending on inventory location handling time can take up to 48 hours. If you have questions regarding shipping estimates, don't hesitate to get in touch with us before placing the order. There is a direct signature requirement for all orders over $500.

      We provide the you the ability to utilize multiple shipping & billing addresses, based upon what fits your current needs. However you are responsible to maintain and update any new address changes, as 365 Cycles will not be held liable for orders being shipped to an incorrect address.

          Returns
          • Our Mistake: If we messed it up you can rest assured we are going to make it right. Contact us by email, phone, or chat and we will make your head spin with how quick we fix it
          • Warranty: We are an authorized retailer for everything we sell, so rest assured your product is covered under the manufacturer's warranty. Contact Us if you are having an issue and we will make sure you are taken care of
          • Just don't want it anymore: We have a 30-day return policy for orders within the US. We offer refunds on returned items that are brand new and in their undamaged, original packaging. Customers are responsible for the cost of return shipping. Damaged, installed, and used items as well as those without original packaging are not eligible for returns. If it's returned in this condition it may be denied and sent back to you

          If you need to return your order please email us at [email protected], call us at 603-968-5797, or use the live chat on our site.


          *Please allow up to 3 business days for us to process your return*

          About Us

          365 Cycles puts the customer above everything. Our number one goal is your satisfaction. When you press the shift lever you want the gears to shift, and when you buy bicycle parts, you want the bicycle parts to arrive on time in new condition. With over 60,000 products and 22 warehouse locations throughout the country, we have the parts you need and they are coming in hot!

          Living an active lifestyle is just that, a lifestyle that never goes away and our goal is to always exceed your expectations so we can take this lifelong journey together. We strive to have the parts you need, at competitive prices with unmatched shipping speeds! 

          If there is ever an issue with an order we will work at warp speed to fix our mistake and make sure you never go a day without a bicycle! If you are not receiving the quality of service you need from one of our exceptionally qualified bicycle experts, tell them Ben Berman told you to tell them "Customer Loyalty" and then name your terms. 

          Our team is waiting to help you 7 days a week and they are more qualified to help than I am but if you ever feel like you're not getting the service you need I’m personally asking you to email me at [email protected] with "CUSTOMER LOYALTY" in the title and I will personally handle your order. 

          Over the years we have served millions of satisfied customers and continue to serve many of them today. With your feedback, we are confident we can take this lifelong journey together and build a friendship that goes beyond parts and accessories.

          If you want to go fast, go alone, if you want to go far, go together.” -Someone Smart

          Ben Berman Founder & CEO of 365 Cycles

          Company Core Values: 

          These were established by the members of our team and we use them every week to call out team members who have shined in one of these areas. Feel free to let us know at [email protected] if someone you worked with has gone above and beyond in one of these areas. 

          Customer Dedication: Put yourself in their shoes and support those who support us.
          You Control the Outcome: "If it is to be, it’s up to me" You are personally responsible for controlling the outcome.
          Seek Understanding: It's easier to complain than it is to understand, avoid the easy route.
          Progress Not Perfection: Pick a direction, analyze the results, and be willing to change course.
          Will to Win: Customers, 365 Team, and Partners, all need the will to win. If they don't have that will, it's our job to give it to them.
          Keep Moving: Move the body, move the mind, and remove any hurdles to achieving an active lifestyle.
          Do the Right Thing: Doing the right thing is more important than doing the thing right.
          Stronger together: If you want to go fast, go alone, if you want to go far, go together. Get your team involved and become stronger together.

          Contact Us

          Selected page contains no content. Add content to this page in the page editor.

          Customer Reviews

          Based on 51 reviews
          80%
          (41)
          12%
          (6)
          8%
          (4)
          0%
          (0)
          0%
          (0)
          H
          Harry Ng

          great authentic Shimano product. have it working with a 11x42 cassette without any modifications (1x10) with Zee shifter;

          M
          Michael Stapleton

          I paired this with a Zee 10spd shifter and a 1x10 drivetrain and took it over some very bumpy trails. No dropped chain and it shifts precisely. Worth the purchase;

          T
          Thomasajimenez1980

          My old retro bike with ZeeDH and Box 4 8 speed shifter. This thing rips. I normally ride single speed but I decided to try some road bike gearing on a old 1990's balance frame. 26th front 12-19 gears out back. This thing climbs great out of the saddle. So if you want to run the Zee derailer on 8 spd the box 4 shifter is your jam!;

          `
          `Ben Ansley

          I’ve been running an original Sram X7 long cage for a couple years on a 1x10 conversion. My local shop recommended the Zee but it was backordered so I was lucky to find it on Amazon. Best decision I’ve ever made. No more dropped chains and shifts extremely quick and crisp. I was able to change it out and get it adjusted pretty easily after watching a few YouTube videos. Out of box it feels sturdy and well made. I highly recommend;

          A
          Amazon Customer

          I was new to mountain biking and this was going on my Cannondale catalyst 4 hardtail. For the money this is one of the best derailleurs you can get and I can say that with confidence. shifts extremely smooth on flat and on slight inclines for more harsh inclines it will still shift it just doesn't like it too much. However behind that and the relatively small range cassette. I have no complaints. if you are looking for something for the trails where there will be a lot of climbing you might want to steer away from this but if you are up for building some serious muscle it is good. Like I said in the title I have run this since 2020 and have had zero problems with it. The durability is also extreme it can take a real bashing and it has taken several rock hits and come out okay.;