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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.

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Here's what others have to say...

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! http://2btherapy.com/bikes/brake-therapy-conversion-kit

I noticed all options above include IS...

I noticed all options above include IS attachment, EXCEPT the pic of the "203 front" which appears as a post mount adapter for 8" remaining 74mm; such as all new shimano brakes are.
BIG QUESTION: if I order the 203 front will I receive the 74 to 74mm, and excuse the IS designation (the photo goes with this selection, i believe). Thanks!!

Responded on

I pitty da foo...

I would not excuse the designation. Probably sold out of the 74-2-74 mounts. If it says IS it most likely is

Responded on

Well pitty putty-
I'll be the eternal optimist; six designations, six pics, and one is P/P, good for the return at least and a damn good price as a generic adapter for all the mutts out there.

Which adapter do I use for post mount rear...

Which adapter do I use for post mount rear frame tabs (new Turner have PM rear instead of 51mm IS)

Responded on

Choose the Rear IS Frame for the size of rotor you are running. So all three will work but if you are running 160mm rotors get the 160 adapter.

Responded on

Standard Avid and Shimano post mount brakes will not need an adapter for 160mm rotors. Use one of them. You should not be able to run IS mount rear calipers on this frame. There maybe an adapter - but the rotors will have to be bigger - 203mm witch most likely will not fit the frame.

I'm comfused, the item # shi0108 fits in...

I'm comfused, the item # shi0108 fits in a post mount fork with IS caliper and 160 mm rotor?

Responded on

this adapter is to convert the post style mounts to shimano style mounts. If you have a 160 mm rotor, choose the Front 160. Or get a new fork.

the 180 rear adaptor will fit the 170mm...

the 180 rear adaptor will fit the 170mm rotor?

Responded on

Just a guess here, but that doesn't seem like it would be the hot set up. It would probably sorta work, but since the 180 adapter sets the caliper further from the axle, I think the pads might not get full contact with the rotor. The result of that would be poor braking and uneven/fast pad wear. What 170mm rotor are you rocking? Magura?

Responded on

Brake track is very crucial, so caliper placement is important. 5mm shims may work on a 160 setup- if you can't find the correct adapter which I suggest.