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32 00... General information and definitions: Toe

Reduction in distance of front of front wheels to rear of front wheels. The toe-in prevents the wheels from moving apart during driving and thus:

the wheels from vibrating and grinding
excessive tire wear
excessive strain on the steering linkage and its links/joints
heavy vehicle steering

Fig 1: Identifying Wheels Toe-In
Courtesy of BMW OF NORTH AMERICA, INC.

Measurement is performed in "straightahead mode".