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SM-MA90 Disc Brake Adapter

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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
  • Item #SHI0547
Shimano front ISO/Post and rear ISO
Recommended Use
getting calipers to fit correctly
Manufacturer Warranty
1 year