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Item # SHI0547

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  • Select options
  • One Color, Post, 180mm ($7.99)
  • One Color, Rear ISO, 160mm ($8.99)
  • One Color, Rear ISO, 180mm ($8.99)
  • One Color, P/P Front, 180mm to 203mm ($7.99)
  • One Color, Rear ISO, 140mm ($8.99)
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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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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: 4h 27m 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: 1h 50m 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.

    Will this adapter work with shimano xt...

    Will this adapter work with shimano xt brakes on a Fox float RL fork (with post mount). Trying to put on a 180mm rotor but want to make sure i get the right adapter. Thanks.

    The Post 180 mount will work no problem.