从负载轮轴到承载单元前边缘的工业尺寸。应针对每种应用情况特别检查突出长度，例如，如果行进路径具有过渡弯道（拐角）。
Dimension of an industrial measured from the load wheel axle to the front edge of the load-carrying unit. The projecting length is to be checked specifically for each application, for example, if the travel path has a transition bend (corner).
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