1979 Volkswagen Beetle Front end

Most tire/wheel imbalance problems will make themselves evident at speeds above 45 to 50 mph. A back-and-forth shimmy in the steering wheel means one or both front wheels are dynamically imbalanced, or a rim is bent

Could be due to an out-of-balance wheel a bent rim, an out-of-round rim or tire, an off-center wheel or hub, or a bent or imbalanced driveshaft? Sometimes the problem is worn shocks or a loose part in the suspension or steering linkage.