Built for rugged E-MTB adventures, the Shimano XT M8260 derailleur combines wireless Di2 shifting with Shimano’s LinkGlide (11-speed) or HyperGlide+ (12-speed) drivetrain compatibility for long-lasting, reliable performance. Drawing power directly from your e-bike’s main battery, it eliminates the need for a separate derailleur battery while delivering consistent, precision shifts. With added durability and advanced technologies like Auto Shift and Free Shift, this derailleur adapts to your ride in real time, whether you’re pedaling or coasting.
Features:
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Direct Wired: Powered directly by your e-bike’s main battery for a steady, reliable power source.
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Robust Design: Reinforced with a wide link structure, alloy skid plate, and solid pulley for long-term durability.
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RD Protection Function: Automatic Impact Recovery brings the derailleur back into alignment after a hit.
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Shimano Shadow ES: An upgraded, low-profile design that enhances chain stability in rough terrain.
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Durable Design: Built to last, especially when paired with a LinkGlide or HyperGlide+ cassette for extended drivetrain life.
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Auto Shift E-Bike Technology: Automatically selects the right gear as you pedal, using smart sensors for smooth transitions.
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Free Shift E-Bike Technology: Allows shifting while coasting, so you’re always in the right gear without needing to pedal.
Please reach out to us with any questions you may have on anything we sell. We want to make sure you get the right items 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 through FedEX and USPS.
Most orders totaling over $59 are eligible to ship for free via an economy ground option of our choice.
Due to larger box sizes, handlebars and other oversized items will have an additional shipping fee.
Most bikes ship free within the continental US. Bike shipping to AK, HI, or PR is available at an additional charge depending on the exact delivery location.
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 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.
Component & Gear Returns
Returns 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.
Bike Returns
Returns or exchange requests for 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.
Return Shipping
Customers may choose to use our provided flat-rate return shipping label at $9, or choose a carrier of their choice to handle their product return.
The $9 flat rate label will be deducted from the refund issued for the return. You can either print this label after requesting a return from the Order History in your Account profile, or you can request that we email you the label.
For all other return shipping methods, please email us at sedona@thundermountainbikes.com after submitting your return request so that we can confirm the shipping information you should use to return your item(s).
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.
RETURN PROCESS
To request a return, please log in to your customer account by clicking the 
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 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.
QUESTIONS ABOUT RETURNS?
If you have any questions concerning our return policy, please contact us at:
