Whether or not you might be in paradoxical possession of post-mount brake calipers and a flat-mount frame or simply want to proper flat-to-flat mount adapter to suit your chosen rotor size, Shimano has a Flat Mount Disc Brake Adapter to get you up and running (and stopping) in a flash. To be had in various post/flat and flat/flat combinations to deal with 140mm and/or 160mm rotors, this adapter installs quickly and ensures your calipers work seamlessly with that shiny new frame.
Compatibility: 140mm rotors, 160mm rotors, post-mount disc calipers, flat-mount disc calipers
Really useful Use: maintenance
Manufacturer Warranty: 2 years