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.

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: returns.thundermountainbikes.com and follow the steps to return eligible items from your order. 

Refunds

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.

Exceptions

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   |   webstore@thundermountainbikes.com

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Customer Reviews

Based on 5 reviews
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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!

H
Haval Kurdy
General shopping experience

One of the best places to shop for Mountain bike parts, great service

J
Jon Gotow
It just works!

Bought an XT to replace my shattered XTR derailleur - Thunder Mountain had it in stock and shipped it fast.

Pro tip: A carbon cage plate and parallelogram linkage on the XTR model save 44 grams, but when you clip the very edge of the derailleur parallelogram on a rock, the whole thing cracks into pieces. XT, on the other hand, is aluminum. Yeah, it's an ounce and change heavier, but more durable than my ill-fated XTR mech. Both of 'em function the same - put it on the bike, dial it in, and you're good to go - shifting is rock solid and perfect every time.

M
Mike Tullai
XT Rear derailleur

Had hard to find items in stock with quick turn around at a fair price!