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On 5 December 2006, Bridgestone Americas and Bandag, Inc. announced a merger agreement whereby Bridgestone would acquire Muscatine, Iowa–based Bandag, Inc., a leading truck tire re–treader that was founded in 1957 and had over 900 franchised dealers worldwide at the time. In announcing the merger, Bridgestone's president in Tokyo explained:
Tire uniformity refers to the dynamic mechanical properties of pneumatic tires as strictly defined by a set of measurement standards and test conditions accepted by global tire and car makers. These standards include the parameters of radial force variation , lateral force variation , conicity, ply steer, radial run-out , lateral run-out , and ...
It is estimated that these tire failures and rollovers cost Bridgestone/Firestone $1.67 billion [72] and Ford Motor Company $530 million. Bridgestone's market price dropped by 50% and the resulting restructuring cost Bridgestone $2 billion. In 2001, Ford recorded a loss of $5.5 billion. [59]
If the tire is not checked, it has the potential to cause vibration in the suspension of the vehicle on which it is mounted. In tire retail shops, tire/wheel assemblies are checked on a spin-balancer, which determines the amount and angle of unbalance. Balance weights are then fitted to the outer and inner flanges of the wheel. [2]
Bump steer can become a problem when cars are modified by lowering or lifting, when a spring has become worn or broken causing a lower ride height, or if the vehicle is heavily loaded. When a car is lowered or lifted, the wheels' toe setting will change. When a car is lowered or lifted, it will have to be re-aligned to avoid excessive tire wear.
The Ackermann Steer Angle is the steer angle at which the vehicle would travel about a curve when there is no lateral acceleration required (at negligibly low speed). The Understeer Gradient (U) is the rate of change of the understeer angle with respect to lateral acceleration on a level road for a given steady state operating condition.