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

Disc Brake Adapter (Shimano)


Regular price $10.99 Sale price$8.99
Shipping calculated at checkout.
  • In stock, ready to ship
  • Backordered, shipping soon
  • Free shipping on all orders $59+

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 items 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 $59 are eligible to ship for free via an economy ground option of our choice.

    Most bikes ship free within the continental US. Bike shipping to AK, HI, or PR is $250.

    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.

    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 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 after submitting your return request so that we can confirm the shipping information you should use to return your item(s).


    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.


    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.


    To request a return, please log in to your customer account by clicking the customer account icon Profile icon in the top right of any page or visit

    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 that 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.


    If you have any questions concerning our return policy, please contact us at:

    (928) 282-1106   |

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    Customer Reviews

    Based on 10 reviews

    Holds caliper on fork

    Has (Phoenix, US)
    Useful for what they are

    Love these guys have a detailed explanation of the description. Made it easy to choose the right parts. Thank you TMB


    Part worked perfectly. Increased rotor size and good to go. Super fast shipping.

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