Shimano Disc Brake Adapter - Thunder Mountain Bikes
Shimano Disc Brake Adapter - Thunder Mountain Bikes
Shimano Disc Brake Adapter - Thunder Mountain Bikes
Disc Brake Adapter (Shimano)

Disc Brake Adapter (Shimano)


Regular price $10.99 Sale price$8.99
  • In stock, ready to ship
  • Inventory on the way
  • Free shipping on all orders $49+

Shimano post mount disc brake adapters allow you to run your preferred rotor size.


  • Material: Aluminum
  • Mounting hardware included

Model No: SM-MA-F180P/P2

  • Size: +20mm
  • Lifts your brake caliper 20mm
  • Example: 180mm post mount fork,  200mm rotor

Model No: SM-MA-F203P/PM

  • Size: +23mm
  • Lifts your brake caliper 23mm
  • Example: 180mm post mount fork,  203mm rotor

Model No: SM-MA-F220P/PM

  • Size: +40mm
  • Lifts your brake caliper 40mm
  • Example: 180mm post mount fork,  220mm rotor

Model No: SM-MA-F203P/P

  • Size: +43mm
  • Lifts your brake caliper 43mm
  • Example: 160mm post mount fork,  203mm rotor


  • Standard post mount brake calipers
  • Post mount forks


    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   |

    This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

    Customer Reviews

    Based on 5 reviews
    Damian R
    40mm disc brake adapter

    It is what it is. Nothing more and nothing less. However, this shop always has a good stock of parts and very quick turnaround time from the time of purchase to it getting to your door. This is my local online shop when local bike shops don't have what I need.

    Perfect for 203mm brake rotor

    This worked perfectly. Surprisingly confusing when researching brake adapters online. I got the SM-MA-F203P/PM, which is well described on this website. My fork is setup for 180mm rotors as well as my frame, used two of these adapters as I am running 203mm rotors front and rear. Worked perfectly.

    Angel Rodriguez

    Perfect service

    Awesome Online Store

    Fast shipping and Accurate product. Keep up the good service. Thank you.

    Frank Dionisio
    Great for converting from 140 to 160mm disc rotor

    Product performs as described on website. Used to convert from 140 to 160mm disc brake rotor. Installed easily with the included bolts/hardware. Delivered promptly. Will order from Thunder Mountain again!