Well thought-out and properly executed tire programs have many benefits. Tire reliability and casing durability have improved to the point where multiple retreads are common, provided inflations are maintained and needed repairs are attended to promptly. The Technology and Maintenance Council offers an excellent diagnostic guide: (RP 648) Troubleshooting Ride Complaints. The basic procedure is to distinguish between tire/wheel issues and driveline problems, with breakdowns in each category. Historically, the industry has addressed vibration reduction by simply balancing mounted tire/wheel assemblies. Indications are that traditional balancing may give way to improved and more energy-efficient ways of obtaining a smoother ride along with cost savings. Any consistent fuel economy advantage is worth exploring in today's operating environment.