A dynamic balancer, comprising an outer housing ; a spindle assembly rotatably mounted to said outer housing and having a spindle shaft and characterized by : a frameless motor assembly comprising a stator coupled to said outer housing and a rotor rotatably received within said stator and connected to said spindle shaft ; a chucking assembly receiving a locking member , said locking member adapted to capture a tire therebetween, said chucking assembly and said locking member captured in said spindle assembly and rotated by said frameless motor assembly ; and an upper rim from which axially extends said locking member which comprises a locking shaft having a plurality of shaft teeth (64 A-D); said chucking assembly having: a lower rim having an inner flange with a shaft opening therethrough adapted to receive said locking shaft , said lower rim having at least one tee cavity , a wedge jaw adapted to be radially moveable in a corresponding one of said at least one tee cavities , said wedge jaw having one side with a plurality of jaw teeth , wherein said jaw teeth are adapted to mesh with said plurality of shaft teeth (64 A-D) and to hold said locking shaft in place so as to rotate with said spindle assembly , a wedge sleeve adapted to be slidable engageable with an opposite side of said wedge jaw , wherein axial movement of said wedge sleeve moves said wedge jaw into and out of engagement with the locking shaft . an outer housing ; a spindle assembly rotatably mounted to said outer housing and having a spindle shaft and characterized by : a frameless motor assembly comprising a stator coupled to said outer housing and a rotor rotatably received within said stator and connected to said spindle shaft ; a chucking assembly receiving a locking member , said locking member adapted to capture a tire therebetween, said chucking assembly and said locking member captured in said spindle assembly and rotated by said frameless motor assembly ; and an upper rim from which axially extends said locking member which comprises a locking shaft having a plurality of shaft teeth (64 A-D); a frameless motor assembly comprising a stator coupled to said outer housing and a rotor rotatably received within said stator and connected to said spindle shaft ; a chucking assembly receiving a locking member , said locking member adapted to capture a tire therebetween, said chucking assembly and said locking member captured in said spindle assembly and rotated by said frameless motor assembly ; and an upper rim from which axially extends said locking member which comprises a locking shaft having a plurality of shaft teeth (64 A-D); a lower rim having an inner flange with a shaft opening therethrough adapted to receive said locking shaft , said lower rim having at least one tee cavity , a wedge jaw adapted to be radially moveable in a corresponding one of said at least one tee cavities , said wedge jaw having one side with a plurality of jaw teeth , wherein said jaw teeth are adapted to mesh with said plurality of shaft teeth (64 A-D) and to hold said locking shaft in place so as to rotate with said spindle assembly , a wedge sleeve adapted to be slidable engageable with an opposite side of said wedge jaw , wherein axial movement of said wedge sleeve moves said wedge jaw into and out of engagement with the locking shaft . <EOS>