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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

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Here's what others have to say...


Factory Equipment

    What else would you use for Shimano Brakes? I decided to upgrade my front brakes from a 160 mm disc to a 180 mm. This part is necessary for that upgrade, moving the brake calipers 20 mm further from the hub to accommodate the larger disc. Works like a charm


    Road Disc Adapter for 140MM to 160MM

    • Familiarity:I've used it once or twice and have initial impressions

    Its a small package from Shimano, all of the proper fittings are included.
    There is a bit of confusion at the moment if you are installing a 160MM rotor on a disc equipped road bike. If you are stepping from a 140MM to a 160MM on your road fork, this is the most likely the part you need. Its simply a 20MM step that mounts inline post -to post on your fork, works if you are originating from a 140MM or 160MM. I used this with a Shimano RS785S setup and an ICE centerlock rotor. Works like a charm, no hassle.

    Road Disc  Adapter for 140MM to 160MM

    Slow your roll

      I always upsize my rotors to 180, front and rear. These will get the job done.

      Unanswered Question

      I have a 2011 Specialized Stumpjumper 29er HT with RockShox Reba RL 29, 9mm-travel w/lockout (15.5": 80mm travel and I am hoping to install the Shimano XT SM-RT86 6-Bolt Disc Brake Rotor (180mm) on the front. I do not know which mounting bracket I need? Can you please help me? I really appreciate it.
      Thank You.

      Austin Blasingame

      Unanswered Question

      I have a Mach 5.7 pivot with fox float fit Tlc up front what brake adapters would I need to go to 160 in back and 180 up front

      Looking to put xtr 9000s on cannondale XLR carbon 90 Lefty, it had 180/160 rotors front & rear respectively. replacing XO brakes, what mounts do I need?

      I have a Mach 5.7 pivot with fox float fit Tlc up front what brake adapters would I need to go to 160 in back and 180 up front

      Unanswered Question

      Following the formula outlined above I need an SM-MA-R180 P/P but don't see that as an available option for ordering. Does running that setup not require an adapter?

      Which adapter do I need for the rear brake on a Santa Cruz Bronson Frame? Using XT Brakes.

      I have done some homework on your disk brake adapter question, and you will have to use item “SM-MA-F160,P/S”. If you have any additional questions, please feel free to call or email me at


      They do exactly what they need to do

        Installing 160's on two different Santa Cruz builds with SRAM guide brake calipers. They fit perfectly.

        What type of rear caliper mount type do I need for 2014 Niner EMD 9, is it ISO, P/S or P/P)? Also, what type of front caliper mount type do I need for RockShox Reba RLT with 15mm thru axle (P/P or P/S)? Thanks in advance.

        Hello, On this particular frame for the rear you would need a P/S adapter and on the front you would need a P/P adapter.

        Thank You.


        Solid connection

        • Familiarity:I've put it through the wringer

        Slapped this on my fork so I could upgrade from a 180mm to 203mm front rotor. It works well and is super easy to install.

        My caliper aligns perfectly with the rotor making stopping easy and smooth. Just make sure you choose the correct adapter for the size rotor and mounting pattern on your bike.


        As advertised

        • Familiarity:I've put it through the wringer

        It does what it is supposed to! Upgraded my 180 to a 203 on my fox 32 fork. As mike said, you might need to go to the hardware store to pick up a couple extra bolts.


        By golly, it fits!

        • Familiarity:I've put it through the wringer

        Worked perfectly to fit my 203 rotor on my fox32 fork. I did have to pick up a new bolt from my LBS but all is well and now I can finally control my braking!


        Does exactly what as advertised!

        • Familiarity:I've put it through the wringer

        All I use is Shimano brakes, this adapters do exactly what they are supposed to and do not fail!


        Replacement for my Tektro A-3 IS Adaptor

          I have been struggling with a problem in the rear brakes of my Giant (Talon)

          It uses Tektro 160 mm (picture).

          Lately, the rear brake is making a lot of VIBRATION. It resonates all the way to the bike handler and seat. Very uncomfortable indeed. In spite of the vibration, the brakes still work fine.

          I have discussed the matter with different people and someone suggested changing the caliper adapter for another one with a different format. I was thinking of trying the SM-MA-R160. Do you think it will work? If not, any suggestion?

          Replacement for my Tektro A-3 IS Adaptor

          I don't see how changing the adapter would have any real effect. you can try cooking the pads if you think they have oil on them, wiping your rotor down with alchohol, sand papering the rotor, changing pads, or a lot of the time it comes down to just upgrading the brakes. It's frustrating to fix a noise or vibration issue.


          What you see is what you get

          • Familiarity:I've used it several times

          I saw, I purchased, I received, I installed, it worked. Usage is a piece of cake, no instructions necessary, and Backcountry shipping got it to me quickly.

          Is there a rear Post to Post adapter for...

          Is there a rear Post to Post adapter for shimano brakes with 180 mm rotor?

          The post to post 180mm mount for the front, will work on the rear.


          Easy installation and perfect fit

          • Familiarity:I've put it through the wringer

          I upgraded to the new Shimano XT brakes and needed adapters. Perfect fit and exact pad alignment on the rotors. Get what works, close doesn't cut it for brakes.