rings 30 38 to the outermost circular row 54 of bosses 46 to recess into the chamfered apertures 70 this is done to allow the brake pads to frictionally engage the braking surfaces 43 44 of the braking rings 30 38 without concern of the brake pads contacting the fastener heads 82 the fastener heads 82 are recessed into the chamfered apertures 70 to allow ample room for wear of the braking rings 30 38 before replacement as previously stated if the rotor body 14 is formed with more or fewer bosses 46 as the exemplary construction of fig1 2 the number of attachment tabs 58 and chamfered apertures 70 will also vary accordingly again with continued reference to fig1 2 the braking rings 30 38 are fastened to the rotor body 14 through the bosses 46 the innermost circular row 50 of bosses 46 include apertures 86 therethrough to allow the fasteners 68 such as conventional nuts and bolts rivets or similar fasteners to pass through the braking rings 30 38 and the rotor body 14 to secure the assembly together such fasteners 68 may be used to secure the braking rings 30 38 to the innermost circular row 50 of bosses 46 because the brake pads are not in contact with the braking rings 30 38 at the attachment tabs 58 further the ends 90 of the fasteners 68 such as the head of.