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  • Avid Post Mount Brake Adapter
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AvidPost Mount Brake Adapter
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Item # AVI000D

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  • Black, 30mm post mount ($14.00)
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Item # AVI000D

Avid's 10, 20, 30, and 40mm Brake Adapters include bolts and spacers to fit a variety of Post Mount configurations. To find the correct components, pick a rotor size and fork/frame interface then reference either Sram's caliper mounting and spacer configurations doc or the tech specs to the side.

  • All necessary bolts and spacers included
Tech SpecsWeight
Tech Specs
Attachment Type
140mm rear post mount, 160mm front post mount
[10mm] 10S fits 170mm Front Rotors, [20mm] 20S/20P fits 180mm Front and 160mm Rear Rotors, [30mm] 40P fits 170mm Rear Rotors, [40mm] 30P fits 200mm Front and 180mm Rear Rotors
Manufacturer Warranty
2 years

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

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Black, 30mm post mount

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  • Familiarity: I've put it through the wringer

Like the others have said. Mandatory if upgrading your front rotor size to 200mm. Get it, easy install, good to go.


  • Familiarity: I've put it through the wringer

I used these adapters to run a 200mm rotor on my Pike while in Whistler.
Super easy to install, and haven't had to worry about them since.

its an adapter

  • Familiarity: I've put it through the wringer

hey they work great, very solid. if you are going to a larger rotor you need them.

Not What I thought I ordered

    I was looking to get some of the spacers and hardware for adapter. I received another adapter in the 40mm, not what I was expecting as I already have the adapter for the rotor.

    My brakes work

      I bought the 20mm for a 200mm rotor on a Lyric fork and it works well. No issues with setup, good product

      Does the trick

      • Familiarity: I've put it through the wringer

      Picked up the 40mm Post mount adapter so I can run a 200mm front rotor. It came as a one piece bracket. It works well. I had to find some different bolts to use but other than that it was good to go.


      • Familiarity: I've put it through the wringer

      I bought the +40 mm post mount adapter to put a 200 mm SRAM Centerline rotor with SRAM Guide R brakes on a 2017 FOX 34 fork (160 mm direct post mount). The +40 mm p/p (post mount to post mount) version is a solid single piece post bracket.

      Also used the +20 mm p/p version to install a 180 mm rotor on my frame (160 mm direct post mount). The +20 mm p/p version consists of two separate post spacers (one per bolt) and uses the self-centering (concave and convex) washers. I’m not a fan of the self-centering washer system but conservatively decided to go all with the same brand and it works well.


      • Familiarity: I've put it through the wringer

      I use these all the time when adding larger rotors on my bike. Sometimes they can be a little tricky to get the fit right but overall they get the job done.

      Swapped for Shimanos

      • Familiarity: I returned this product before using it

      I originally got these Avid Post Mount Brake Adapters for my new SRAM Guide RSC Disc Brakes but swapped them for the Shimano Disc Brake Adapters (Item #SHI0108). 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 - - 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

      Swapped for Shimanos

      Functional but finicky

      • Familiarity: I've put it through the wringer

      Functional adapter for larger rotor sizes but can be challenging to adjust.

      Great Solution

        Recently built up a bike with Sram Guide RSC brakes and Centerline X rotors. Use this adapter kit with Guide rotors and brakes to ensure full pad contact on the rotor. I was running the Shimano PP 180mm and found that the rotor contact was slightly off.

        Gotta have it

        • Familiarity: I've put it through the wringer

        Way cleaner than adapters of old, looks very good and does the job.


        • Familiarity: I've put it through the wringer

        I picked up the 20mm post kit, mainly because I needed longer hardware for a Shimano post mount that I had laying around. I'm always happy to have a handful of spare washers and spacers though!

        Buy a set for each wheel

        • Familiarity: I've put it through the wringer

        The kit gives you a "standard" and "CPS" set of spacers. Throw away the spacers you don't need. You will need to buy two sets if you have two identical brakes.

        Nothing fancy, but they work great!

        • Familiarity: I've put it through the wringer

        Few things are standard anymore and that goes for frame and fork specs or rotor sizes across the various disc brake options that are available. Use these kits to adapt your rotor size to your frame's specs.

        These kits work great and include two sets of hardware so that you'll be set whether or not your brake calipers require CPS washers (many Avid's do). I ordered a couple of kits so that I could run a 160 mm rear rotor on a 140 mm post mount frame and also a 180 mm front rotor on a 160 post mount fork. The included instructions confirmed the correct location of all of the required washers and spacers so that I didn't have to guess.

        Unanswered Question

        My 2012 Specialized Stumpjumper HT is 140mm...

        My 2012 Specialized Stumpjumper HT is 140mm post-mount rear with the 20mm spacers on it to work with the 160mm rotor/Avid Elixir 7s that came stock on the bike. I'm swapping the brakes out for Shimano XTs with 160mm rotors. Can I just continue to use the Avid spacers that are already on the post mounts? Do I need to get the Shimano-specific post-mount adapter?