adapter for 170 MM rotor. * "FOR POST" = Rear frame Post adapter for 160 MM rotor. For BR-M755-DH downhill brake calipers: Adapter plate to mount Shimano BR-M755-DH calipers to use 203 MM rotors. Select for particular application: * "FOR DH ON BOXXER" = Rock Shox Boxxer front fork adapter for 203 MM rotor. * "FOR DH ON MANITOU" = Manitou X-Vert-Carbon (2000-01 models) front fork adapter for 203 MM rotor. * "FOR DH ON IS REAR" = Rear frame IS adapter for 203 MM rotors.  (less)