Disc Brake Adapter
Disc Brake Adapter
Disc Brake Adapter

Disc Brake Adapter

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

Shimano Disc Brake Adapter

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


Model No: SM-MA-F180P/P2
  • Mount: 160mm & 180mm post
  • Rotor: 160mm & 180mm
  • Material: Aluminum
  • Mounting hardware included

Model No: SM-MA-F203P/PM

  • Mount: 180mm post
  • Rotor: 203mm
  • Material: Aluminum
  • Mounting hardware included

Model No: SM-MA-F220P/PM

  • Mount: 180mm post
  • Rotor: 220mm
  • Material: Aluminum
  • Mounting hardware included


  • SM-MA-F180P/P2: 
    • 140mm post-mount frame with a 160mm rotor
    • 160mm post-mount frame/fork with a 180mm rotor
  • SM-MA-F203P/PM:
    • 180mm post-mount frame/fork with a 203mm rotor
  • SM-MA-F220P/PM:
    • 180mm post-mount frame/fork with a 220mm rotor

Effective Nov 19, 2021, for all online orders placed on or after Nov 19, 2021.

Note: For all orders placed before November 19th.  Please see the old Policy here.

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!  

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 delivery date. 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. 

If you are unsure if your item qualifies for a return.  Please email us first: webstore@thundermountainbikes.com

Return shipping charges will be paid for by the customer. 

As a convenience, we can send you a pre-paid return label.  The return shipping charge will be deducted from your refund when using our pre-paid label.  Return shipping rates are as follows:  

  • Bicycles: Customer pays the quoted amount.  Please contact us.
  • Oversized (Kuat racks etc.): $40 per box
  • Wheels: $20 per box
  • Medium packages: $10 per box/envelope
  • Small packages (Grips, brake pads, etc.): $5 box/envelope

Return Process

To return an item, please follow the steps below:

  1. Email us at webstore@thundermountainbikes.com. Please note the order number, the items that needed to be returned, and why.
  2. Once approved,  we will notify you of the return label charge and email a pre-paid shipping label.
  3. Place the item in its original packaging, including all tags.
  4. Pack the item securely to prevent any damage on its return trip.
  5. Drop the item off at your local post office.


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. Paid shipping charges will not be refunded. We will notify you by email when your return has been processed.


We do not accept Exchanges. Instead,  return the item as outlined above and place a new order for the item you would like to purchase.  This will get the item into your hands weeks faster than an exchange would.


For defective, damaged, or if we sent you the wrong products, please contact us using the phone number or email below.     


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

No reviews yet