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Shimano Flat Mount Disc Brake Adapter

57% Off
sale from $9.99 $31.99

Select Style & Size

  • Rear, Post Caliper To Flat Mount, 140mm
    sale $19.19
  • Front, Flat Caliper To Flat Mount, 140/160mm
    sale $14.99
  • Rear, Post Caliper To Flat Mount, 160mm
    sale $19.19
  • Front, Post Caliper To Flat Mount, 140mm
    sale $9.99
  • Front, Post Caliper To Flat Mount, 160mm
    sale $13.99

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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
Recommended Use
Manufacturer Warranty
2 years

Tech Specs

What do you think about this product?


>Rating: 5

If You Are Building Your Own Bike...

I've used it several times

I ordered a frame set and couldn’t figure out at first how to fit a 160mm rotor on the rear of my bike with the Shimano Dura Ace right/rear brake caliper shifter combo. Then I found this handy little adapter. The left/front shifter caliper set comes with an adapter that can be flipped to fit the 140mm or 160mm rotor.

>Rating: 5


Fit and function were excellent

>Rating: 5

Worked as advertised

I've put it through the wringer

Converted my 140mm rear rotor on a BMC Roadmachine 01 to 160mm so I could interchange wheels from several bikes. Easy to install. No worries here.

>Rating: 5


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.

>Rating: 5

Life Saver

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.

Right now there are no adapters that would allow flat mount calipers on post mount frames. The one you mention means adapting a post mount caliper to a flat mount frame. I am glad I called shimano before being really dissapointed once I ordered it.