Deore CS-M5100 Cassette
Deore CS-M5100 Cassette

Deore CS-M5100 Cassette

SKU: ICSM510011142

Regular price $78.99 Sale price$58.99
Rear Speeds
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

Perfect for front single and double MTB drivetrains, SHIMANO's M5100-11cassette offers Rider Tuned gear steps for maximum cadence control across the varied terrain of mountain biking. Available in 11-42t and 11-51t configuration


  • Cassette Cogs: 11-42t: 11-13-15-17-19-21-24-28-32-37-42t
  • Cassette Cogs: 11-51t: 11-13-15-18-21-24-28-33-39-45-51t
  • Compatible Chain: HG-X11 11-speed
  • Series: Deore
  • Generation: M5100
  • Number of Speeds: 11
  • Finish: Plated

Shimano Deore Compatability:

Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right part the first time. Our lifelong riders at Thunder Mountain Bikes are knowledgeable and would love to talk to you!


We currently offer both economy and expedited shipping options though FedEX and USPS. 

Orders totaling over $49 are eligible to ship for free via an economy ground option of our choice. 

If you're in need of something super-quick, please contact us directly. We may be able to overnight your order with an additional fee and depending on your location. 


Should there be an issue with the item you bought, or you no longer need your purchase, we will be happy to set up a return.

Returns or exchange requests for New or Used Bikes must be requested by emailing us at within fifteen (15) days from the date of delivery. Bikes must be in un-ridden condition. Custom-built bikes may not be returned. Returned bikes have a $200 restocking fee and the customer pays for return shipping.

Returns for most other items may be requested within sixty (60) days of the delivery date. All returned items must be received in new, unused, and uninstalled condition, with the original tags and labels attached and in the original packaging. We cannot accept returns on any items installed or show wear of any kind. 

Clearance and open-box items may not be returned. 


To request a return, please log in to your customer account by clicking the  customer account icon  Profile icon in the top right of any page or visit

1. In the Email field, enter your email address and click Continue.

2. In your email account, open the email sent from our store and copy the six-digit verification code included in the email.

3. Go back to the online store and enter a six-digit verification code to log in.

4. Find and click on the order that you want to submit a return for.

5. If your order has more than one item, select only the items you want to return.

6. Select a return reason and add a note for the store if needed.

7. Click Request Return.

Once your return request is approved, you will receive an email with shipping instructions and a return shipping label. 


We will process your return after we receive your returned item(s) and inspect the condition. Please allow at least seven (7) days from the receipt of your item to process your refund. We will notify you by email when your return has been processed.


If you receive defective or damaged products or if we sent you the wrong products, please contact us using the phone number or email below.


If you have any questions concerning our return policy, please contact us at:

(928) 282-1106   |

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Customer Reviews

Based on 7 reviews
Warren Williams
Great service

Very helpful with purchase

Arian Davis

Cassette arrived quickly and solved my shifting problem. Would have done the SLX or XT version but due to supply chain issues three are out of stock.

callan hasling
Great Product

Ordered mine to replace an identical, broken cassette. It came quickly in the mail, and arrived in perfect condition. Great product and great company (cool free sticker)

yannick marzin

Came on time, within the box.

Wilber Guerra
Shimano m5100

Very good product excellent costumer service and faster shipping