Shimano Disc Brake Adapters
ShimanoDisc Brake Adapters


Whether you're trying to mount your 160mm rotor with an ISO or post-mount setup, we've got the right Shimano Disc Brake Adapters for the job. All you need is the skeleton key to understanding Shimano's admittedly byzantine model naming convention. SM-MA stands for Shimano Mount Adapter, so that'll be universal across models and can be safely ignored now that you're here.

The rest of the model name is the important part. An "F" denotes front brake and an "R" denotes rear brake. The following number (160, 180, or 203) is, of course, the rotor size, with special parentheticals for 203mm rotor conversion. The final two initials respectively describe the caliper type and the frame/fork mount type with either a "P" (post-mount) or an "S" (ISO). To alleviate confusion, we've reiterated the front or rear specification at the back.

To recap, model number SM-MA-F160, P/S Front is for the front brake (F), it accommodates a 160mm rotor (160), it holds a post-mount caliper (P), and it attaches to an ISO fork mount (/S).

  • Durable alloy construction
  • Mounting hardware included
  • Compatible with ISO and post-mount calipers and frames/forks
  • Reviews
  • Q & A

Does what it should

    Easy to use and does exactly what it needs to do.

    Works as intended

    • Familiarity: I've put it through the wringer

    You will likely need one or two of these to mount up your disc brakes, get the right ones for your set up and youre good to go!

    Mount it up

    • Familiarity: I've put it through the wringer

    Durable and easy to install, brake adapters are necessary on many frames and forks if you are running a larger rotor size.

    Works with Avids Too

    • Familiarity: I've put it through the wringer

    These work for any brakes as far as I know, I used them to mount my Guide brakes with some 203 rotors. So if you have trouble finding certain adapters for certain brands in stock ever, know that you can cross brands since the spacing is all standardized. Full disclosure, can't guarantee it works with all brands/caliper shapes. But I have used shimano adapters with several sets of Guide brakes over the last few years so I can say that works for sure.

    Works great.

    • Familiarity: I've put it through the wringer

    These work great and are easy to install.

    they're great!

    • Familiarity: I've put it through the wringer

    These make it super easy to swap to a larger or smaller brake rotor with ease. Just make sure you know which one to buy. The description breaks it down for you if you're confused.

    Necessary for larger rotors

    • Familiarity: I've used it several times

    Got a fork that’s built for a smaller rotor than the one you want to use? This is the answer. Just make sure you order the right one for the mount and caliper.


    • Familiarity: I've put it through the wringer

    Easy to use and a good option for upgrading your rotors to a larger diameter


    • Familiarity: I've put it through the wringer

    i love running bigger rotors so In return I love that this lets me run them! never had an issue with these!

    It Works

    • Familiarity: I've put it through the wringer

    If you are using Shimano brakes this is a must have. Super easy to match up what you need.

    Gotta have it

    • Familiarity: I've put it through the wringer

    You gotta have adapters if running a larger rotor. The Shimano adapters do the trick.

    Still an adapter

      It does adapt correctly. Black anodized is nice. They should mill these out for weight savings haha

      Adapts like it says

        These are simple and easy. You don't need those oldschool cup and cone washers

        It works

        • Familiarity: I've used it several times

        Comes with everything you need to increase stopping power. Easy to install with clear instructions included.

        Worked perfectly on a Giant Trance 2

          I bought two of these adapters for my Trance 2 and they worked great. You use the same adapter for the front and the rear. The arrow on the front faces up and on the rear the arrow faces forward. I went from a 180 mm rotor to the 203 mm rotor, front and rear. I used the Shimano RT-86 ice tech rotors (XT 6 bolt style). I am very pleased with the performance and braking power it gave me. The only thing that is confusing is the photo shown. The photo shows the IS/Post but the description shows the correct one for Post/Post

          Part is great. Shipping was overpriced.

          • Familiarity: I've used it several times

          Part is great and have no qualms about it. However, I paid for overnight shipping, and it came in three days. That really is bs when you pay an extra 20 bucks for shipping and it still doesn't come when you need it. very disappointing.

          Did you order on a Friday? HAHAHA

          I want to put a 203mm rotor on a rock shox pike using SRAM guide RSC brakes. What is the model of adapter I need.



          I'm not sure, but this unit is for Shimano brakes.

          Fit like a glove

          • Familiarity: I've used it several times

          The letter f will fit rear for p/p 180, if you are wondering. Needed an adaptor p/p on front and rear on my Niner jet 9 and was searching for letter designation for rear for 180mm p/p adaptor. Anyway fit like a glove. Love competitive cyclist, but you guys are going to have to step your game up in the shipping department. Way to slow!

          Yeti SB6

          • Familiarity: I've put it through the wringer

          Works on my 2016 Yeti SB6 with Fox 36 fork. Running 180 rotors front and rear. Bought 2 - SM-MA-F180, Post/Post Front/Rear. Running guide brakes.


            With this, you can put bigger rotors on your bike, and stop faster.