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.

All returns must be requested within sixty (60) days of the fulfillment date (i.e. the date we printed the shipping label and boxed up your order.) All returned items must be received in new and unused condition, with the original tags and labels attached, and in the original packaging.  We cannot accept returns on any items that have been installed or show wear of any kind. 

Return Process

To request a return, please visit: and follow the steps to return eligible items from your order. 


After receiving your return and inspecting the condition of your item, we will process your return. Please allow at least seven (7) days from the receipt of your item to process your return or exchange. We will notify you by email when your return has been processed.

For all Special Order items, there is a 25% restocking fee. Special Order items are those that we do not currently stock.


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

Other questions?

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

(928) 282-1106   |

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Customer Reviews

Based on 6 reviews
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

Collin randel
Nicely inexpensive

Nice quality. For a 51