QM40 Adapter bracket (replaces QM20+, QM6 and QM27). Adapts Post-mount (PM) caliper to Post-mount (PM).

For fork to use 180mm rotors on a 160mm direct mount fork. 

For Rear brake to use 160mm rotor on a 140mm direct mount, or a 180mm rotor on a 160mm direct mount.

Please refer to the chart attached for more information.