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Flat Mount Disc Brake Adapter

3.6666666666666665 out of 5 stars
3 Reviews
Current price: $12.15 - $30.59 Original price: $36.99
Up to 55% off

Style & Size:


Why We Like The Flat Mount Disc Brake Adapter

Whether you're in paradoxical possession of post-mount brake calipers and a flat-mount frame or just need to correct flat-to-flat mount adapter to fit your chosen rotor size, Shimano has a Flat Mount Disc Brake Adapter to get you up and running (and stopping) in a flash. Available in a variety of post/flat and flat/flat combinations to accommodate 140mm and/or 160mm rotors, this adapter installs quickly and ensures your calipers work seamlessly with that shiny new frame.


  • Adapt flat-mount calipers to different mounts and rotor sizes
  • Available in post/flat and flat/flat combinations
  • Options for both 140mm and 160mm rotors
  • Item #SHI00B1
140mm rotors, 160mm rotors, post-mount disc calipers, flat-mount disc calipers
1 adapter
Manufacturer Warranty
2 years

Overall Rating

3.5 based on 3 ratings

Review Summary

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

Fits Slightly Large

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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1 out of 5 stars

April 10, 2024

WARNING: does not work with NEW FM160

I've put it through the wringer

This part converts FM140 mount to PM160. Most modern forks use the Newer FM160 mounting standard, meaning that this is a +20 adapter, and some folks have said that the caliper will rub on a 180 rotor using this adapter.


Originally reviewed on

5 out of 5 stars

September 20, 2023

Easy replcement

I've used it several times

I used this to convert a 140mm rotor with a 160. Extremely simple, quick, installation

Joe B

Originally reviewed on

5 out of 5 stars

August 31, 2021

160 Rear Adapter -So useful I bought two

I've put it through the wringer

Both my road and gravel bikes had 160mm front and 140mm rear rotors. Found them lacking stopping power. Decided to try an upgrade to 160mm in the rear and was floored on how much more confidence inspiring they were on steep descents. Bought the second adapter for my other bike immediately after the first test ride.

Louis B

Originally reviewed on