Deore XT BL-M8100 Brake Lever Blade
Deore XT BL-M8100 Brake Lever Blade

Deore XT BL-M8100 Brake Lever Blade

SKU: Y2RR98020

Regular price$29.00
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

Replacement Shimano lever member unit (blade) for Shimano BL-M8100 brake levers.


  • Deore XT BL-M8100 brake lever (BR-M8100 & BR-M8120 brake sets & calipers)

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 20 reviews
Mark Kennet
Fast turnaround for urgently needed part.

I took a spill on my mtb and broke a brake lever blade. Thunder Mountain sent me a new one post haste and got me back on the bike.


Excellent part. This is a direct replacement for the SLX leaver as well. SLX seem to be on forever out of stock.

Shimano brake lever broke

I broke my SLX BL M7100 brake lever and couldn’t find any replacement blades in stock at any bike shop or online sites due to Shimano had no inventory for quite some time and no availability for anytime in the near future. Thunder Mountain Bikes were great. After they told me they weren’t available they helped me out where no other site or bike shop did. They suggested I order the XT BL M8100 blade as they are in stock. They 100% confirmed to me they would fit despite a couple of reviews stating they wouldn’t. Let me say these levers will fit for the SLX BL M7100 blades. The only difference is they have a area of little dimples for your finger to grip. Im so glade for their knowledge and suggestion of how to help me where nobody gave me any second thought only to just say “nope none available”. I normally don’t take the time to write reviews but Thunder Mountain earned my time to write this to help others like me with locating a replacement blade. I live on the east coast and received them in just a few days. Very please with the levers and TMB. Thanks

Scott Sease
Great Service

Great service! Received order fast and in perfect condition. Thank you!!

Mark Brux
Replaced broken Right/Rear lever blade

Correct part (for right-rear brake handle), works great, comes with new spring, replaces the old (cracked / broken) lever by itself mechanically; no hydraulic brake system servicing (bleed & feed) needed, as long as no other braking system damage or malfunction.