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Shimano Disc Brake Adapters

Sale $5.98 - $11.95

Item # SHI0108

Select options
  • Select options
  • SM-MA-R160, IS/Post Rear ($8.00)
  • SM-MA-R180, IS/Post Rear ($8.00)
  • SM-MA-R203, IS/Post Rear ($8.00)
  • SM-MA-F160, IS/Post Front ($8.00)
  • SM-MA-F180, IS/Post Front ($8.00)
  • SM-MA-F203 (160mm to 203mm), IS/Post Front ($8.00)
  • SM-MA-F180, Post/Post Front/Rear ($5.98)
  • SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear ($8.00)
  • SM-MA-F180, IS/IS Front ($11.95)
  • SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear ($7.99)
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Item # SHI0108

Description

Description

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

Weight

Weight

Actual Weight

Actual weights are measured in-house by the Competitive Cyclist team.

Have questions? Chat with a Gearhead

Grams

Oz

SM-MA-R160, IS/Post Rear
610g
21.52oz
SM-MA-R180, IS/Post Rear
610g
21.52oz
SM-MA-R203, IS/Post Rear
610g
21.52oz
SM-MA-F160, IS/Post Front
28g
0.99oz
SM-MA-F180, IS/Post Front
28g
0.99oz
SM-MA-F203 (160mm to 203mm), IS/Post Front
28g
0.99oz
SM-MA-F180, Post/Post Front/Rear
34g
1.20oz
SM-MA-F203 (160mm to 203mm), Post/Post Front/Rear
34g
1.20oz
SM-MA-F180, IS/IS Front
47g
1.66oz
SM-MA-F203 (180mm to 203mm), Post/Post Front/Rear
34g
1.20oz
Weight is for brake adapter with hardware.

Reviews & Community

REVIEWS

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good luck!!

  • Familiarity: I've used it several times

work great if you can figure out shimanos part numbers and fitment!!!....wooo hoooo!

Necessary

  • Familiarity: I've put it through the wringer

Great little adapters to ensure that your brakes fit your bike.

Required parts

  • Familiarity: I've put it through the wringer

If you want to follow the trend of having a 180mm rotor for the rear brake, you will need this if you have a Santa Cruz or any other brand that uses an international standard brake mount.

Avg. ride time: 3h 24m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Necessary

  • Familiarity: I've put it through the wringer

Works well with not only Shimano, but other brands as well. Just be sure to get the correct one for your application and should be smooth sailing.

Works as intended

  • Familiarity: I've put it through the wringer

You will likely need one or two of these to mount up your disc brakes, get the right ones for your set up and youre good to go!

Mount it up

  • Familiarity: I've put it through the wringer

Durable and easy to install, brake adapters are necessary on many frames and forks if you are running a larger rotor size.


Works with Avids Too

  • Familiarity: I've put it through the wringer

These work for any brakes as far as I know, I used them to mount my Guide brakes with some 203 rotors. So if you have trouble finding certain adapters for certain brands in stock ever, know that you can cross brands since the spacing is all standardized. Full disclosure, can't guarantee it works with all brands/caliper shapes. But I have used shimano adapters with several sets of Guide brakes over the last few years so I can say that works for sure.

Avg. ride time: 42m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

Works great.

  • Familiarity: I've put it through the wringer

These work great and are easy to install.

they're great!

  • Familiarity: I've put it through the wringer

These make it super easy to swap to a larger or smaller brake rotor with ease. Just make sure you know which one to buy. The description breaks it down for you if you're confused.

Necessary for larger rotors

  • Familiarity: I've used it several times

Got a fork that’s built for a smaller rotor than the one you want to use? This is the answer. Just make sure you order the right one for the mount and caliper.

Simple

  • Familiarity: I've put it through the wringer

Easy to use and a good option for upgrading your rotors to a larger diameter

Avg. ride time: 4m per week
  • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

great

  • Familiarity: I've put it through the wringer

i love running bigger rotors so In return I love that this lets me run them! never had an issue with these!

It Works

  • Familiarity: I've put it through the wringer

If you are using Shimano brakes this is a must have. Super easy to match up what you need.

Gotta have it

  • Familiarity: I've put it through the wringer

You gotta have adapters if running a larger rotor. The Shimano adapters do the trick.

It works

  • Familiarity: I've used it several times

Comes with everything you need to increase stopping power. Easy to install with clear instructions included.

Worked perfectly on a Giant Trance 2

    I bought two of these adapters for my Trance 2 and they worked great. You use the same adapter for the front and the rear. The arrow on the front faces up and on the rear the arrow faces forward. I went from a 180 mm rotor to the 203 mm rotor, front and rear. I used the Shimano RT-86 ice tech rotors (XT 6 bolt style). I am very pleased with the performance and braking power it gave me. The only thing that is confusing is the photo shown. The photo shows the IS/Post but the description shows the correct one for Post/Post