The Shimano Flat Mount Adapter allows you to fit flat-mount disc brake calipers to a standard disc brake mounts frame. This mount is compatible with both 140 mm and 160 mm discs. All you have to do is flip the adapter.
For mounting Shimano Calipers on Flat Mount frames and forks
Fits either 74mm or Flat mount calipers
Front adapters Include mounting hardware (rear mounting bolts are frame thickness specific and sold separately)