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We mount the best tires on the rear for your safety. Placing the tire with the least amount of tread on the rear wheels could potentially cause an over steer condition (i.e. fishtailing). This condition causes a loss of control when turning or during abrupt lane changes. These problems are magnified by the loss of traction at the rear wheels in wet, icy, or slick conditions.
Oversteer, or fishtailing, occurs when the back-end of your vehicle turns more than the front-end and, through centrifugal force, your rear tires lose grip with the driving surface. Once this happens you are no longer in control of the vehicles direction.
During adverse weather conditions (i.e. rain, snow, ice, etc..) this problem is drastically more pronounced and commonly referred to as hydroplaning or "tire slip." During hydroplaning your vehicle's tires actually lose contact with the driving surface, potentially creating a more dangerous scenario.
The tire industry recommends a difference of 3/32nds of tread depth or less between your front and rear tires. This applies to 2 tire installations as well as tire rotation. This standard is supported by the Tire Industry Association (TIA), Rubber Manufacturers Association (RMA), Tire Manufacturers (Michelin, Goodyear, and Cooper etc.), and vehicle manufacturers (Chevrolet, Ford, Honda, BMW, etc.) guidelines.