Deore XT RD-M8100 Rear Derailleur

Deore XT RD-M8100 Rear Derailleur

SKU: IRDM8100SGS

Regular price$118.99
/
Rear Speeds
Cage Length
Color
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

The all-new Shimano Deore XT M8100 series of derailleurs brings a new level of drivetrain silence thanks to decreased tension in the low gear position and an added bumper on the pulley cage. Larger 13T pulleys increase efficiency and chain management while compatibility with SHIMANO's new 12-speed cassettes boosts range.

Details:

CAGE LENGTH SGS/Long
MAX FRONT DIFFERENCE 0
COLOR SERIES COLOR
MOUNT Direct attachment (conventional)/Direct mount compatible
TENSION PULLEY BEARING Sealed Bearing
GUIDE PULLEY BEARING Sealed Bearing
NUMBER OF PULLEY TEETH 13
SERIES XT
GENERATION M8100
MAX LOW SPROCKET 51t
MIN LOW SPROCKET 45t
TOP NORMAL SPRING TYPE Shimano Shadow RD+
REAR SPEEDS 12
WEIGHT 284 grams

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!

Shipping

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. 

RETURNS

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 sedona@thundermountainbikes.com 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. 

RETURN PROCESS

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 account.thundermountainbikes.com

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. 

REFUNDS

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.

EXCEPTIONS

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.

OTHER QUESTIONS?

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

(928) 282-1106   |   sedona@thundermountainbikes.com

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Customer Reviews

Based on 8 reviews
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E
EDWARD BYRON
Smoooove

Nice upgrade from Deore, so quiet and quick shifting.

D
Derek Bonevelle
Perfect & fast shipping!

Perfect replacement. Sleek and beautiful design.

M
Mark Weitz
XT 12 Speed derailleur

This is a beautiful piece of machinery. It works flawlessly and is easy to setup.

When there was no availability I ordered one of these on EBay from China and it never shifted correctly. I’m guessing it was an (expensive) counterfeit. I removed it today and put the new one from Thundermointainbikes today and it’s like butter. I have two of these from Thunder, so a fresh one and a spare. Along with the XTR chains that were on sale last week I’m set for a couple of weeks worth of crashes. 😂

J
Jose Fraga
Fast processing and delivery

They had the part I need it and processed and shipped ASAP. I was back on the bike in no time.

S
Steve
XT rear derailleur upgrade

This was an upgrade on my Orbea OIZ H30 which came with a Shimano Deore RD-M6100 rear derailleur and shifter (I also upgraded to the XT shifter, which I purchased locally). The Deore XT parts perform much better - smoother, quicker shifting and a more solid feel overall, especially when downshifting. Definitely a good upgrade, and Thunder Mountain offered a competitive price and fast free shipping. I'm considering an upgrade to the XT cassette as well, but so far the change has been awesome already. 5 stars all around!