Description Magura QM40 Brake Adaptor Front 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.
