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  • Avid - Post Mount Brake Adapter - Black

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  • Avid - Post Mount Brake Adapter - Black

Avid Post Mount Brake Adapter

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    • Black, 20mm post mount
      sale $16.00
    • Black, 40mm post mount
      sale $16.00
    • Black, 30mm post mount
      sale $16.00

    10 Reviews


    Finagle your mismatched brake rotors and post mounts into a coherent speed-regulating package with the Avid Post Mount Brake Adapters. Just find your rotor size and fork/frame interface, then pick the adapter kit that's right for your current setup. Easy peasy.

    • All necessary bolts and spacers included
    • Item #AVI000D

    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

    Tech Specs

    • Reviews
    • Q & A

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    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.

    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

    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?