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Item # SHI0108

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  • Select options
  • SM-MA-F160, IS/Post Front ($7.95)
  • SM-MA-F180, Post/Post Front/Rear ($5.98)
  • SM-MA-F180, IS/Post Front ($7.95)
  • SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear ($7.95)
  • SM-MA-F203 (160mm to 203mm), IS/Post Front ($7.95)
  • SM-MA-R160, IS/Post Rear ($7.95)
  • SM-MA-R180, IS/Post Rear ($7.95)
  • SM-MA-R203, IS/Post Rear ($7.95)
  • SM-MA-F180, IS/IS Front ($11.95)
  • SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear ($7.95)
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Item # SHI0108


Like much of life, making your Shimano disc brakes work with your 160mm rotor is easy --once you learn how to figure out which adapter you need. Whatever you have, we can either sell you the adapters to make it work, or tell you that what you have is enough.

You need to know three things -- what kind of mount your Shimano disc caliper is, International Standard (ISO) or post mount. If it goes on the front, you need to know what your fork is: ISO, post-mount, or a few special cases (Marzocchi 20mm axle, Boxxer-type). And, you need to know the rotor size that you're trying to fit -- in this case, it's 160mm.

If you're trying to diagnose what you already have and/or what you need, here's how to do it. The Shimano adapters all have a model number that starts with SM. The Mount Adapter acronym is MA. Front brake is F. Rear brake is R. Rotor Size is 160, 180, or 203. Caliper Mount Type will be S for ISO/International A, and P will represent Post. And the last letter will be for the frame or fork mount type: S for ISO/A, P for Post, B for Boxxer, Z for Marzocchi 20mm Axle as well as QR20Plus and DH ISO. Thus an adapter that reads SM-MA-F-203S/P is Shimano Small Parts Mount Adapter Front 203mm Rotor with ISO caliper on a Post type fork.

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

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Unanswered Question

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.



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.

Unanswered Question

i have a 2017 yeti sb6 and sram guide rs brakes with 180mm rear rotors now, is this the brake adaptor i need to use sram's centerline 200mm rotors in the rear? there's currently an adaptor installed

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

    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: 6h 5m 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.