A bicycle frame of the type having a head tube, a seat bracket and a bottom bracket, each having hollow lugs extending therefrom and joined together by cylindrical tubes extending over and attached to the lugs, having an internal cable system in which the top lugs of the head tube and seat bracket each have a cable outlet, and a cable, such as a brake cable, is threaded through the cable outlets and along the tube joining the head tube and seat bracket. The cable outlet of the head tube is positioned immediately adjacent to the open, tubular segment of the head tube. Positioning the outlets on the lugs preserves the structural integrity of the top tube and facilitates replacement of the cable. Replacement is effected by pushing the cable through the cable outlet of the seat bracket, along the tube to the head tube, then out through the head tube cable outlet. The cable tip may be guided through the head tube cable outlet by inserting one's index finger through the head tube opening to deflect the cable tip toward the head tube cable outlet.