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Item # SHI0108

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  • Select options
  • SM-MA-F160, P/S Front ($8.96)
  • SM-MA-F180, P/P Front ($8.96)
  • SM-MA-F180, P/S Front ($8.96)
  • SM-MA-F203 (160mm to 203mm), P/P Front ($8.96)
  • SM-MA-F203 (160mm to 203mm), P/S Front ($8.96)
  • SM-MA-R160, P/S Rear ($6.99)
  • SM-MA-R180, P/S Rear ($8.96)
  • SM-MA-R203, P/S Rear ($8.96)
  • SM-MA-F203 (180mm to 203mm), P/P Front ($8.96)
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Item # SHI0108


Like much of life, making your Shimano disc brakes work with your 160mm rotor is easy --once you learn how to figure out which adapter you need. Whatever you have, we can either sell you the adapters to make it work, or tell you that what you have is enough.

You need to know three things -- what kind of mount your Shimano disc caliper is, International Standard (ISO) or post mount. If it goes on the front, you need to know what your fork is: ISO, post-mount, or a few special cases (Marzocchi 20mm axle, Boxxer-type). And, you need to know the rotor size that you're trying to fit -- in this case, it's 160mm.

If you're trying to diagnose what you already have and/or what you need, here's how to do it. The Shimano adapters all have a model number that starts with SM. The Mount Adapter acronym is MA. Front brake is F. Rear brake is R. Rotor Size is 160, 180, or 203. Caliper Mount Type will be S for ISO/International A, and P will represent Post. And the last letter will be for the frame or fork mount type: S for ISO/A, P for Post, B for Boxxer, Z for Marzocchi 20mm Axle as well as QR20Plus and DH ISO. Thus an adapter that reads SM-MA-F-203S/P is Shimano Small Parts Mount Adapter Front 203mm Rotor with ISO caliper on a Post type fork.

  • Durable alloy construction
  • Mounting hardware included
  • Compatible with ISO and post-mount calipers and frames/forks

Tech Specs

Recommended Use:
Stopping your bike

Reviews & Community

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Shimano Disc Brake Adapters

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Here's what others have to say...

Unanswered Question

Looking to put xtr 9000s on cannondale XLR carbon 90 Lefty, it had 180/160 rotors front & rear respectively. replacing XO brakes, what mounts do I need?

Unanswered Question

Following the formula outlined above I need an SM-MA-R180 P/P but don't see that as an available option for ordering. Does running that setup not require an adapter?

Which adapter do I need for the rear brake on a Santa Cruz Bronson Frame? Using XT Brakes.

Responded on

I have done some homework on your disk brake adapter question, and you will have to use item “SM-MA-F160,P/S”. If you have any additional questions, please feel free to call or email me at

5 5

They do exactly what they need to do

Installing 160's on two different Santa Cruz builds with SRAM guide brake calipers. They fit perfectly.

What type of rear caliper mount type do I need for 2014 Niner EMD 9, is it ISO, P/S or P/P)? Also, what type of front caliper mount type do I need for RockShox Reba RLT with 15mm thru axle (P/P or P/S)? Thanks in advance.

Responded on

Hello, On this particular frame for the rear you would need a P/S adapter and on the front you would need a P/P adapter.

Thank You.

5 5

Solid connection

  • Familiarity: I've put it through the wringer

Slapped this on my fork so I could upgrade from a 180mm to 203mm front rotor. It works well and is super easy to install.

My caliper aligns perfectly with the rotor making stopping easy and smooth. Just make sure you choose the correct adapter for the size rotor and mounting pattern on your bike.

5 5

As advertised

  • Familiarity: I've put it through the wringer

It does what it is supposed to! Upgraded my 180 to a 203 on my fox 32 fork. As mike said, you might need to go to the hardware store to pick up a couple extra bolts.

5 5

By golly, it fits!

  • Familiarity: I've put it through the wringer

Worked perfectly to fit my 203 rotor on my fox32 fork. I did have to pick up a new bolt from my LBS but all is well and now I can finally control my braking!

5 5

Does exactly what as advertised!

  • Familiarity: I've put it through the wringer

All I use is Shimano brakes, this adapters do exactly what they are supposed to and do not fail!

5 5

Replacement for my Tektro A-3 IS Adaptor

I have been struggling with a problem in the rear brakes of my Giant (Talon)
It uses Tektro 160 mm (picture).
Lately, the rear brake is making a lot of VIBRATION. It resonates all the way to the bike handler and seat. Very uncomfortable indeed. In spite of the vibration, the brakes still work fine.
I have discussed the matter with different people and someone suggested changing the caliper adapter for another one with a different format. I was thinking of trying the SM-MA-R160. Do you think it will work? If not, any suggestion?

Replacement for my Tektro A-3 IS Adaptor
4 5

What you see is what you get

  • Familiarity: I've used it several times

I saw, I purchased, I received, I installed, it worked. Usage is a piece of cake, no instructions necessary, and Backcountry shipping got it to me quickly.

Is there a rear Post to Post adapter for...

Is there a rear Post to Post adapter for shimano brakes with 180 mm rotor?

Responded on

The post to post 180mm mount for the front, will work on the rear.

5 5

Easy installation and perfect fit

  • Familiarity: I've put it through the wringer

I upgraded to the new Shimano XT brakes and needed adapters. Perfect fit and exact pad alignment on the rotors. Get what works, close doesn't cut it for brakes.

5 5


  • Familiarity: I've put it through the wringer

This put my caliper right where it needed to be... nice! Do your homework, buy the right adapter, and you'll be on the trails in no time.

5 5

Got one when I upgraded the rotor

I got one of these when I upgraded to a larger rotor for my Tallboy.

5 5

Works Perfectly with Shimano Saint

I bought this to match up a 203 rotor on a Fox 40 and it works perfectly. If you are using Shimano brakes this is a must have.

is there a rear disc convertion or a non...

is there a rear disc convertion or a non disc bike

Responded on

Yes there is. Upgrading your frame to a new one with built in brake mounts is your best choice, but if that isn't an option, you can try this!