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Shimano - Disc Brake Adapters

Shimano Disc Brake Adapters

64% Off
$5.99 - $8.00 Original price:$18.99
Changing the size selection, or changing the selected color after selecting a size, may change the associated price

Select Style & Size

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  • Select options
    • SM-MA-R160, IS/Post Rear
      sale $8.00
    • SM-MA-F160, IS/Post Front
      sale $6.99
    • SM-MA-F203 (160mm to 203mm), IS/Post Front
      sale $5.99
    • SM-MA-F180, IS/IS Front
      sale $6.79



    Disc 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

    Exact fit

    • Familiarity: I've put it through the wringer
    • Fit: True to size
    • Size Bought: 160-203 p2p

    Purchased to go from 160 to 203 post to post.

    No washers needed other than what came with it.

    Beat on the bike and it holds alignment just fine

    Fits as advertised - easy to use

    • Familiarity: I've put it through the wringer

    Not a ton to write - the adapter is easy to install, true to size and easy to dial in, stays dialed in, and reasonably priced. It's very straightforward - kind of like getting an A on a first grade spelling test, but hey, it's an A.

    Adapter, bolts and no washers.

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

    I ordered this to mount my Shimano M8020 caliper to my front fork paired with a 203mm rotor. The packaging includes the adapter, and 2 mounting bolts. BEWARE; no cup and cone washers are included. I feel that the washers should be included but understand they are not necessary. Wish they were more clear about what’s included in the packaging. 4 out of 5 starts because the washers should be included. The washers came with my rear adapters.

    203mm brakes on RM Instinct

      I loved my X2's with 180mm rotors, but I wanted more braking power without spending $500+ dollars for 4-piston brakes. So I did what a lot of people do in my situation and bought big ol' rotors and some adapters. For $100, I picked up rotors and adapters and I now have a noticeable increase in power while keeping the brake set I love.

      As others have said, the part numbers are very confusing, so hopefully these photos will clarify what's needed for 160mm and 180mm post mount applications.

      Sidenote: I was advised to avoid the Hope 203mm two-piece rotors on the Fox 34 due to clearance issues. I'm glad I chose the one-piece. It's a very tight fit but they clear, and they're about $15 less. Stoked!

      203mm brakes on RM Instinct

      Shimano brake adapter 180 to 203

        Part # SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear

        Hope X2 brakes with 203mm Hope one-piece rotors onto my Rocky Mountain Instinct (180mm post mount).

        Shimano brake adapter 180 to 203

        Shimano brake disc adapter 160 to 203

          Part # SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear
          Mounted Hope X2 brakes with Hope one-piece 203 rotors on my Fox 34 (160mm post mount ) fork. I recommend one-piece rotors on the Fox 34 to avoid clearance issues. It's a tight fit.

          Shimano brake disc adapter 160 to 203


          • Familiarity: I've used it several times

          Got some to make my ripmo 203 F/R. Some pictures don't actually match what you're getting.

          Works with SRAM Guides

          • Familiarity: I've put it through the wringer

          Used this for a hardtail build. The profile worked well with the shape of the SRAM Guide RSC calipers.

          As Expected

          • Familiarity: I've put it through the wringer

          Does its thing and does it well. No complaints for this here.

          Part works great, Part #'s not so much

          • Familiarity: I've put it through the wringer

          If you need it you need it. Simple adapter to hook it up.

          Hit us up if you have any questions on the application for your bike.

          For forks with 180mm mounts

            My fork has 160mm mounts so this one doesn't work for using a 203mm rotor.

            A must.

              Shimano's part numbers can be confusing. Be sure to hit the "Chat Now" button to get help from a Gearhead who can help confirm the correct adapter for your frame.

              good luck!!

              • Familiarity: I've used it several times

              work great if you can figure out shimanos part numbers and fitment!!!....wooo hoooo!


              • Familiarity: I've put it through the wringer

              Great little adapters to ensure that your brakes fit your bike.