The pivot points may be bushings or ball bearings. Needle roller bearings were fitted to the swingarm instead of the earlier plain bushings. It has bronze piston pin bushings and free-floating piston pins. The piston pins floated in the connecting rod bushings. A kingpin bolt holds these parts together, and fits inside the bushings. Firmer rear sub-frame bushings and wider 17-inch wheels contribute to improved traction. The rear suspension is changed from rubber bushings to pillowball bushings. The rear suspension cradle is mounted directly to the body without any rubber bushings. A bolt called a "kingpin" holds these parts together and fits inside the bushings. Finally the remaining length of the rivets is flattened into the flanged bushings. The cantilever gives space for the through bushings and isolators. The road car had softer suspension bushings to have better ride quality and tractability. Grommets in electrical applications are referred to as "insulating bushings". The wheels are made out of plastic along with the bushings. Examples include&colon; terminals for high-voltage cables, bushings of power transformers, and insulation of high-frequency antennas.