Deore XT CN-M8100 Chain

Deore XT CN-M8100 Chain

SKU: ICNM8100138Q

Regular price$48.99
Rear Speeds
Chain Links
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

The M8100 chain provides enhanced chain retention thanks to an extended portion of the inner plate. The new chain features quick-link assembly and SIL-TEC treatment for extended offroad durability.

**The 126 link chain is discontinued.  The 138 link chain is new for 2023.


  • Series: Deore XT M8100
  • Type: HG
  • Speeds: 12-speed
  • Roller link plate: Sil-Tec
  • # of links: 138


  • Quicklink: XTR SM-CN910-12
  • Rear Derailleur:  Shimano 12-speed rear derailleurs
  • Cassette:  Shimano 12-speed cassettes

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   |

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Customer Reviews

Based on 4 reviews
Jay Fuller
XT chain

Perfect fit and long lasting chain if you take care of it

Shimano CN-M8100 Chain and Cassette

Thunder Mountain has come through once again. They had the items I needed instock and shipped to my doorstep. 2-day delivery and perfectly packaged.

Damon Reuning
genuine XT cn-m8100 chain

Great chain makes a difference good interface between chain and XT cassette. The reason the Tittle is GENUINE XT cn-m8100 is because I've gotten a counterfeit from another supply in the past and the minute I popped a pin out of this chain to shorten it to the desired length I could tell it was the real deal. Very smooth-running chain!

Bryan Sands
XT chain

Really can't say enough about XT. I decided to swap all of my bikes from SRAM to XT, and the shifting is totally silent and immediate. I did have to warranty my first XT derailleur but all of the new ones have worked stellar. I guess we will see about longevity in time. But as far as set up, shifting quality and lack of noise, XT over SRAM in my opinion(and I mean all SRAM models). Make sure to measure the chain at Sag to get proper length and you'll be all set. The dealer manual on Shimanos website is fantastic, and it has a step by step of installing a full drivetrain. Highly recommend reading it. There are some quirky differences between XT and XTR and 1x vs 2x as far as set up.

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