Detail Images

  • Shimano - Disc Brake Adapters - SM-MA-R160
  • Shimano - Disc Brake Adapters - SM-MA-R180
  • Shimano - Disc Brake Adapters - SM-MA-R203
  • Shimano - Disc Brake Adapters - SM-MA-F160
  • Shimano - Disc Brake Adapters - SM-MA-F180
  • Shimano - Disc Brake Adapters - SM-MA-F203 (160mm to 203mm)
  • Shimano - Disc Brake Adapters - SM-MA-F203 (180mm to 203mm)

Current Color

  • Shimano - Disc Brake Adapters - SM-MA-R160
  • Shimano - Disc Brake Adapters - SM-MA-R180
  • Shimano - Disc Brake Adapters - SM-MA-R203
  • Shimano - Disc Brake Adapters - SM-MA-F160
  • Shimano - Disc Brake Adapters - SM-MA-F180
  • Shimano - Disc Brake Adapters - SM-MA-F203 (160mm to 203mm)
  • Shimano - Disc Brake Adapters - SM-MA-F203 (180mm to 203mm)

Shimano Disc Brake Adapters

sale $5.98 - $12.99

Free 2-Day shipping on orders over $50*

Select your style & size:

Select options
  • Select options
    • SM-MA-R160, IS/Post Rear
      $8.99
    • SM-MA-R180, IS/Post Rear
      $8.99
    • SM-MA-R203, IS/Post Rear
      $8.99
    • SM-MA-F160, IS/Post Front
      $8.99
    • SM-MA-F180, IS/Post Front
      $8.99
    • SM-MA-F203 (160mm to 203mm), IS/Post Front
      $8.99
    • SM-MA-F180, Post/Post Front/Rear
      sale $5.98
    • SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear
      $8.99
    • SM-MA-F180, IS/IS Front
      sale $6.95
    • SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear
      $7.99
    4.5534

    34 Reviews

    Details

    Adapt.

    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
    • Item #SHI0108

    Tech Specs

    Recommended Use
    Stopping your bike

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    Gotta Have It

    • Familiarity: I've put it through the wringer

    Cracking the Shimano-speak code to figure out which one you need is the hardest part. Once you have the right one, it's easy to install, and does what it needs to do. Never had an issue with any of these that I've used.

    Better Choice than Avids

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

    I originally got the Avid Post Mount Brake Adapters (Item #AVI000D) for my new SRAM Guide RSC Disc Brakes but swapped them for these Shimano Disc Brake Adapters. Much better choice and cleaner look on my bike, no extra washers or spacers required.



    Big thanks to Joe Bolton in our Retail Store Bike Shop for getting my new Mach 6 put together. If you are ever in Salt Lake City definitely stop by our Retail Store to check out their bike selection and visit Joe (2607 S 3200 W, Suite A, West Valley UT 84119). Contact me with any questions about these adapters, especially if you are interested in custom building a new mountain bike.



    Kyle L. - Expert Gearhead - klivingston@backcountry.com - 801-736-4337



    Frame - Pivot Mach 6, Large Stealth Black/Green

    Brakes - SRAM Guide RSC Disc Brake - Black Ano, 180mm front/180mm rear

    Adapters - Shimano SM-MA-F180, P/P Front

    Better Choice than Avids

    Needed for bigger rotors

    • Familiarity: I've put it through the wringer

    I recently went from a fork with 200mm posts, to a 180mm post, and needed to get an adapter. Installation is as simple as installing a caliper right to the post, but the extra spacing allows for larger rotors.

    Shimano upgrade for trial bike

    • Familiarity: I've used it several times

    Used the MA-F180P/S to upgrade the terrible front brake on my newly acquired trial bike. It came stock with a 180 rotor and IS mount caliper. This bracket placed my new XT caliper right into place. Very easy to install, and the extra description provided by Backcountry helped ease my mind that I chose the right part the first time. True thanks to them for the great explanation!

    Solution for the 2015 Fox Float +203mm

    • Familiarity: I've put it through the wringer

    Finally, a perfect solution when you have the 2015+ Fox Float fork and want to mount a 203mm front rotor. Much better than using a 180mm spacer + washers

    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

      Thanks for the post. Any idea of this will also work for a rear brake. My Fuji CX is currently meant for 140mm rotors. Just curious if this adapter (SM-MA-F180, P/P Front) will also for the rear to make it work with a 160mm rotor. Thanks!

      Hi Peter , its works on both front and rear brakes for stepping from 140MM to 160MM. I have successfully used them on both Shimano hydraulic and non-hydraulic disc calipers. Its confusing because the part number is the same for front and rear, when mounting post to post with a 20MM step.

      Unanswered Question

      I have a realm beach cruser from the 60s it comes stock with springer forks I would like to put a disc brake on the front is there a adapter that will work on the springer forks for a disc brake. I'm about ready to give up and go for a drum brake. Thanks

      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

      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?

      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.

      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.

      is there a rear disc convertion or a non...

      is there a rear disc convertion or a non disc bike

      I noticed all options above include IS...

      I noticed all options above include IS attachment, EXCEPT the pic of the "203 front" which appears as a post mount adapter for 8" remaining 74mm; such as all new shimano brakes are.
      BIG QUESTION: if I order the 203 front will I receive the 74 to 74mm, and excuse the IS designation (the photo goes with this selection, i believe). Thanks!!

      Which adapter do I use for post mount rear...

      Which adapter do I use for post mount rear frame tabs (new Turner have PM rear instead of 51mm IS)

      Standard Avid and Shimano post mount brakes will not need an adapter for 160mm rotors. Use one of them. You should not be able to run IS mount rear calipers on this frame. There maybe an adapter - but the rotors will have to be bigger - 203mm witch most likely will not fit the frame.

      I'm comfused, the item # shi0108 fits in...

      I'm comfused, the item # shi0108 fits in a post mount fork with IS caliper and 160 mm rotor?

      the 180 rear adaptor will fit the 170mm...

      the 180 rear adaptor will fit the 170mm rotor?

      Just a guess here, but that doesn't seem like it would be the hot set up. It would probably sorta work, but since the 180 adapter sets the caliper further from the axle, I think the pads might not get full contact with the rotor. The result of that would be poor braking and uneven/fast pad wear. What 170mm rotor are you rocking? Magura?