[RKDinOKC]

Porsches wear rear tires twice as fast as the fronts due to the suspension geometry of the rear suspension. As the car is lowered the tires the toe goes positive. As it is raised the toe goes negative. The wear could be called toe scrub. Every time you accelerate or brake the weight transfer and front to rear sway of the car changes the rear toe. On my 944 Turbo this was so pronounced that the car would dolphin (steer left then right) under extreme acceleration as the left or right tire got more traction.

The 928 was the first production car application of the Weissach rear suspension design to take full advantage of this toe change and added side loading toe change to provide rear wheel steering in higher G turns.