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

Deore XT BL-M8100 Brake Lever Blade

SKU: Y2RR98010

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 10 reviews
Jim M.
OEM Replacement (***Important: Serves as sacrificial weakest link!***)

This blade is designed to serve as the sacrificial weakest link that preserves more expensive parts of Deore XT BL-M8100 brake levers. My originals worked as designed during an unfortunate OTB incident which broke one side and bent the other, so I opted to replace both. Front/Left was out of stock so I ordered two Rear/Right and reused the original Front/Left spring since the blades are identical otherwise. I paid extra to expedite delivery from Arizona to Maryland which took only two business days via USPS Priority Mail. Installation was relatively straightforward (back out the clamp screw, pop out the pin through the top, remove blade with spring, and replace), though getting the spring lined up with the lever while reinserting the pin is tedious (there may be a trick that I don't know). No need to bleed the cylinders!

Russ Levitan

Deore XT BL-M8100 Brake Lever Blade

Jasper Roach
Well designed brake lever

Everyone knows Shimano XT is a sweet spot for price and durability, and the 8100 series components don't disappoint. That being said, these levers will break when hit in a crash. I'm glad I was able to find this replacement lever without having to replace the master cylinder assembly. The return spring is a little hard to reinstall so have some patience :) Thank Thunder Mountain

Jon Gustavson
XT replacement lever blade

Not compatible with SLX 7100 brake levers as hoped and unable to return since attempted install of blade

Leslie Chow
just what I needed

broke my brake lever blade and was so happy to find this rather than have to get the whole brake lever assembly (which is unavailable for 12 months anyways, yay supply chain..) customer service was great and was able to expedite shipping to make some scheduled rides. thx thunder mountain bikes!