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Shimano - SM-MA90 Disc Brake Adapter

Shimano SM-MA90 Disc Brake Adapter

53% Off
$7.08 Original price:$14.99
Changing the size selection, or changing the selected color after selecting a size, may change the associated price

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    • One Color, Rear ISO, 140mm
      sale $7.08



    Tech Specs

    Shimano front ISO/Post and rear ISO
    Recommended Use:
    getting calipers to fit correctly
    Manufacturer Warranty:
    1 year

    SM-MA90 Disc Brake Adapter

    With the SM-MA90 Disc Brake Adapter, Shimano has taken an artful leap at the lowly disc brake adapter. Not only is it lighter than their older adapters, but it's more refined -- this refinement being the reason for its lightness. Where Shimano's older adapters were blocky, this one has curved edges. Where they were solid, this one has a window machined out of the center of the adapter body.

    The Shimano SM-MA90 Disc Brake Adapter is available in five versions to fit 160 and 180mm rotors for front ISO or Post mounts and rear ISO mounts.

    • Handy brake adapters for switching up brake style
    • Capable of adapting post mount or ISO mounts
    • Curved edges are streamlined for slick setup
    • Cutout window sheds weight on setup
    • Available for 140, 160, and 180-millimeter rotors

    Does the job like a boss

      This adapter does exactly what it's supposed to. If you have post mounts and want to size up your rotors, this is the one you need. Not sure anyone actually uses the included safety wire, but its cool that Shimano includes it.

      Works Wonderfully

      • Familiarity: I've used it several times

      It adapted my fork from 180 to 200. Its all I want in a brake adapter

      Best brake adapters

      • Familiarity: I've put it through the wringer

      Shimano makes the best brake adapters. I don't always run Shimano brakes but I always use their adapters. They are easier to set up than others on the market and seem to be the best design available.

      Make it allllll work!

        A must have to up your rotor size. Always great to upgrade!

        Adapt it

        • Familiarity: I've put it through the wringer

        Nothing better for running a larger rotor than the correct adapter. I used the Shimano adapter to go from a 160mm to 180mm post mount fork.

        So you went XTR

          We see that, and we respect that. Now, make sure that everything plays nicely together by making sure you use the correct hardware. These not only drop weight, but use a different bolt to match with the XTR calipers.

          Not just for 180

          • Familiarity: I've put it through the wringer

          Got the 180 post mount adapter. Essentially its a 10mm spacer used to increase rotor size by 20mm. Worked great with TRP HYRD to mount 160mm rotors on a Ritchey cross fork. Also used it to swap up from 160 to 180 front rotor on my mtb bike. Does what it needs to do.

          Lets you run a 180mm front

            What you'll need to run a 180mm front rotor (or bigger). Pretty much does it as advertised.

            What you will need!

              Makes mounting 180 rotors a snap! Works as stated and light weight.

              Highly Adaptable

              • Familiarity: I've put it through the wringer

              These can be a little confusing, call a competitive sales rep if you need guidance. The Shimano adaptors are primo, and work nicely with Shimano brakes, or whatever else you happen to be using.

              Mount up

              • Familiarity: I've used it several times

              Necessity when mounting disc brakes to a bike. Light and easy to install.

              used them with guide breaks

              • Familiarity: I've put it through the wringer

              I recommend using these instead of the sram break adapters for the guide breaks. easy to install.

              Basic excecution

              • Familiarity: I've put it through the wringer

              It is amazing that a seemingly basic component can be done in so many different ways at different degrees of successful execution. Shimano does theirs very well. keeps the caliper stable and in the correct position with very little, if any flex. You need this adapter for most builds today.

              Correct spacing

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

              Pretty much necessary for most builds nowadays, these are a great choice!

              I like big rotors

              • Familiarity: I've put it through the wringer

              So I use these to adjust my brakes.

              gotta have it

              • Familiarity: I've used it several times

              My fat bike came with hydraulic 160mm rotors in front and back. For winter, I wanted mechanical brakes and figured I'd upsize the front. Need an adapter to accommodate the 180mm rotor. I used this even though installing TRP Spykes with an centerline rotor--it's all working well together.

              Does the job

              • Familiarity: I've put it through the wringer

              Light, and a necessity for running larger rotors out back in 180 size

              180s 4eva

              • Familiarity: I've put it through the wringer

              I always upsize my rotors to 180, front and rear. These will get the job done.