Shimano XTR RT-MT900 Center Lock Disc Brake Rotor - Thunder Mountain Bikes
Shimano XTR RT-MT900 Center Lock Disc Brake Rotor - Thunder Mountain Bikes
Shimano XTR RT-MT900 Center Lock Disc Brake Rotor - Thunder Mountain Bikes
Shimano XTR RT-MT900 Center Lock Disc Brake Rotor - Thunder Mountain Bikes

XTR RT-MT900 Center Lock Disc Brake Rotor


Regular price Sale price$81.99
  • Low stock - 2 items left
  • Inventory on the way
  • Free shipping on all orders $49+

Shimano XTR RT-MT900 Center Lock Disc Brake Rotor

The pinnacle in mountain bike braking, Shimano XTR RT-MT900 disc brake rotors deliver superb stopping power for the most aggressive riding. The Ice Technologies Freeza rotors dissipate heat to maintain braking performance on long downhill stretches. Shimano's center lock mounting system makes installing and removing rotors quick and easy thanks to the spine mount and lock ring design.



  • Model No: RT-MT900
  • Series: XTR M9100
  • Mount: Center lock
  • Sizes: 140mm, 160 mm, 180 mm, 203 mm
  • Weight: 88 (140 mm), 108 (160 mm), 132 (180 mm), 150 grams (203 mm)
  • Included lockring: Externally notched



  • Compatible with both metal and resin Shimano brake pads


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.

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


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.


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   |

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Customer Reviews

Based on 5 reviews
Dennis Clair
Great selection, great price

I try to support small and local shops. Found Thunder Mountain and will try to get all my parts from them.



Ron Santopietro
Shimano brake pads and rotors

Fast service and delivery. Parts were in stock which was great. Thanks for a smooth quick transaction. Got me back on the trail fast.

Arthur Rodriguez

XTR RT-MT900 Center Lock Disc Brake Rotor

Steven Smith
180/203 upsize

Very happy with the rotor, overall it is a robust part and has increased the breaking power as I hoped by investing in the size change to 203.

Shipping was extremely fast, best service ever! Thank you