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Item # SHI0547

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  • One Color, Post, 180mm ($12.99)
  • One Color, Rear ISO, 160mm ($12.99)
  • One Color, Rear ISO, 180mm ($12.99)
  • One Color, P/P Front, 180mm to 203mm ($12.99)
  • One Color, Rear ISO, 140mm ($10.39)
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Item # SHI0547

Description

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.

Tech Specs

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

Reviews & Community

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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.

    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.

    Avg. ride time: 11m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    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.

    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.

    Avg. ride time: 45m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    Does the job

    • Familiarity: I've put it through the wringer

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

    Unanswered Question

    I have a 140 post mount rear and I want to use a 160 disc rotor, which adapter do I choose?

    Avg. ride time: 2h 48m per week
    • Average ride time is based on Strava activity over the last 3 months. Give your reviews credibility by connecting your account.

    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.

    Upgrade to 180

      I recently installed new rotors on my Santa Cruz Tallboy LTC. After riding a friends bike which had 180mm rotors front and rear, I decided I'd do the same. It's made a noticeable difference for sure. I got the Post for the front and the ISO option for the rear. Just a heads up sometimes ISO is referred to as IS.

      Fits Avid brakes

      • Familiarity: I've put it through the wringer

      Bought this to install a Avid Elixir 9 Trail front caliper on a post to post mount using a 180 Rotor. Fits perfectly! Avid for some strange reason does not sell a 180mm adapter, but only provides them on complete bikes.