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Item # SHI00B1

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  • Rear, Flat To Flat, 160mm ($18.00)
  • Rear, Post To Flat, 140mm ($31.99)
  • Front, Flat To Flat, 140/160mm ($22.00)
  • Rear, Post To Flat, 160mm ($31.99)
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Item # SHI00B1


Whether you're in paradoxical possession of flat mount brake calipers and a post mount frame, have that situation in reverse, or just need to correct flat-to-flat mount adapter to fit your chosen rotor size, Shimano has a Shimano Flat Mount Disc Brake Adapter to get you up and running 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 to different mounts and rotor sizes
  • Available in flat/post, post/flat, and flat/flat combinations
  • Options for both 140mm and 160mm rotors

Tech Specs

140mm rotors, 160mm rotors, post-mount disc calipers, flat-mount disc calipers
Recommended Use:
Manufacturer Warranty:
2 years
Actual Weight:
Rear, Flat To Flat, 160mm: 11g; Rear, Post To Flat, 140mm: 25g

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  • Familiarity: I've used it once or twice and have initial impressions

If you need to fit post-mount calipers onto a flat-mount frameset, these little adapters are the way to go. The end result might not look as clean as using a flat-mount caliper, but I'm more than happy to make that compromise if it lets me save the few hundred dollars a new brake system would cost.

Life Saver

  • Familiarity: I've used it once or twice and have initial impressions

So I just got a new gravel bike and the ENVE Gravel road fork that came on the frame is the new flat mount standard. The SRAM RED Hydraulic disc brake set that I have is a post mount. I really did not want to buy a new caliper for this new standard, admittedly it would have a cleaner look if I used a flat mount caliper, but I really did not want to shell out extra cash. In comes the Shimano flat mount disc brake adapter to the rescue. I picked up the 160mm "Front Post to Flat" adapter and voila! Everything was right in the world again.

The description indicates that this adapter allows for installing a flat-mount caliper on a post-mount frame. Is this true? If so, which ones would I need for front and rear? "Post to flat" to me would mean you have post calipers you need to install on a flat frame, so I was looking for an item called "flat to post"--but do I have this backwards?

Thanks in advance.

Hi, so this mount is for installing a post mount or standard brake caliper onto a flat mount frame.