Shimano SLX SM-RT66 Disc Brake Rotor - Thunder Mountain Bikes
Shimano SLX SM-RT66 Disc Brake Rotor - Thunder Mountain Bikes
Shimano SLX SM-RT66 Disc Brake Rotor - Thunder Mountain Bikes

SLX SM-RT66 Disc Brake Rotor


Regular price $33.99 Sale price$22.99
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

Shimano's SM-RT66 6-bolt disc brake rotors deliver consistent stopping power in all riding conditions. The rotor's reliable anti-loosen plate construction makes for quick and secure installation.



  • Model No: SM-RT66
  • Reliable and easy anti-loosen plate
  • Metal pad compatible
  • 6-bolt
  • Sizes: 160mm, 180mm, 203mm, 220mm


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 4 reviews
James Anderson

SLX SM-RT66 Disc Brake Rotor

Loyd Turner
Upgraded my front brake with a 220 Rotor

Made the jump to a 220 front rotor. Shimano XT 4-piston setup so I stayed with the OEM rotor and wasn't disappointed. A huge increase in braking performance overall. Would highly recommend this upgrade.

David Nonnenmann
Your Customer Support

I will continue to order because your service is amazing. Thanks for the expedited shipping on my last 2 orders.

Silent braking

This rotor restored my bikes smooth and quiet braking.