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Item # SHI0108

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  • Select options
  • SM-MA-F160, IS/Post Front ($8.99)
  • SM-MA-F180, Post/Post Front/Rear ($5.98)
  • SM-MA-F180, IS/Post Front ($8.99)
  • SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear ($8.99)
  • SM-MA-F203 (160mm to 203mm), IS/Post Front ($8.99)
  • 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-F180, IS/IS Front ($5.72)
  • SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear ($7.99)
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Item # SHI0108


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

Tech Specs

Recommended Use:
Stopping your bike

Reviews & Community


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Make your rotors fit your frame

    This simple piece of metal makes it possible for you to reach unprecedented speeds biking, and come back alive. simply select the version you need, attach it to your frame and caliper, and magically when you squeeze the lever on your bar, you will begin to slow down. Amazing.

    go big, go bigger

    • Familiarity: I've put it through the wringer

    Built a Jones bike recently and JeffJ advocates 203mm rotors up front, 180mm in back. Needed the appropriate adapters to get the discs around those big rotors. Mounted quickly, adjusted appropriately. Worked perfect.

    Making brakes and rotor get along

    • Familiarity: I've put it through the wringer

    So you got new brakes and rotors, awesome! Now you need to make everything play nice. There are a number of different adapters to go from all the different rotor sizes and mounting standards. You can look up what you need or ask a bike CS rep, but if you're rocking Shimano brake set up, these will have the peace maker for your bike.

    Choose the Right

    • Familiarity: I've used it several times

    Necessary part for bikes with rotors 140 plus. Just make sure you select the correct model and don't trust our photos to be the exact sub-model. Feel free to call us with any questions at 1-888-276-7130 for parts questions.

    Fox 36 YES

    • Familiarity: I've put it through the wringer

    Finally, a cheap solution to mounting my 203mm rotor to my Fox 36 perfectly. Couldn't believe Fox wanted $35 for the 180mm to 203mm P/P adapter. I love their stuff but come on. Shimano for the win

    Helps in slowing down.

    • Familiarity: I've used it several times

    Changed a rotor and needed this to make things work. Easy install and now I'm good to go. Or stop... Whatever...

    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

    Easy to install

    • Familiarity: I've put it through the wringer

    I would use these for Sram or shimano brakes. Work the best for either option and they are super easy to install brakes with.

    Avg. ride time: 3h 42m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    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.

    Avg. ride time: 29m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Great Adapter

    • Familiarity: I've put it through the wringer

    This is a great adapter for disc brakes. Find which one you need and get it. These adapters keep your caliper where you need it with little flex.

    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