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Disc Brake Adapters

4 out of 5 stars
4 Reviews
Current price: $7.14 - $14.24 Original price: $18.99
Up to 45% off
Color:Black, SM-MA-F220P/PL



Why We Like The Disc Brake Adapters

Whether you're trying to mount your rotor with an IS 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 the front brake and an "R" denotes the 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, corresponding to either ISO or post-mount.


  • Shimano brake adapters for various rotor sizes
  • Compatible with ISO and post-mount calipers and frames/forks
  • Mounting hardware included
  • Item #SHI0108
Attachment Type
post, IS
mounting hardware
mountain biking, cycling
Manufacturer Warranty
2 years

Overall Rating

4 based on 4 ratings

Review Summary

1 Stars - 0 reviews
2 Stars - 1 reviews
3 Stars - 0 reviews
4 Stars - 1 reviews
5 Stars - 2 reviews

Fits True To Size

Screen reader users: the following list provides a visual scale to illustrate the product fit. Please refer to the heading above for the fit type in text.
Runs smallTrue to sizeRuns large

What do you think about this product?


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5 out of 5 stars

March 28, 2024

Works as expected

I've put it through the wringer

Purchased to increase rotor on Surly Lowside from 160mm to 180mm. East to install and works as designed.


Originally reviewed on Backcountry.com

2 out of 5 stars

May 21, 2023

maybe it will work better with shimano

got this to convert 180 to 200mm sram guide RE, which has the CPS washer system, unfortunately I was unable to get the caliper height to be correct with this adapter and hardware, seemed like the pads were never really in the right spot on the rotor. I see no reason why this would not work with non CPS systems, screw you sram for your proprietary crap lol

Trevor W

Originally reviewed on Backcountry.com

4 out of 5 stars

July 22, 2022

No Install instructions

There's a QR code that's supposed to take you to the install manual but it took me to a page with various notices/warnings but no information on how to install. It's mostly straightforward, however there's one piece where I'm not sure if it's an extra part... Pretty frustrated by Shimano's QR code manuals. I'll give it 4 stars for quality but not having basic install instructions isn't great

Erin S

Originally reviewed on Backcountry.com

5 out of 5 stars

October 15, 2020

Exact fit

I've put it through the wringer
Size Bought:
160-203 p2p
5' 9"

Purchased to go from 160 to 203 post to post. No washers needed other than what came with it. Beat on the bike and it holds alignment just fine

Hannah O