適用於單車拖行的高位到手拉穩定的低位，直覺性操作。
「高位拖行」方便於平坦、平緩路面。 「低位拖行」則能大幅提昇拖曳平衡。
From 20cm to initial position, for hand trace and storage. Intuitive operation.
High position for clearance. Low position for better balancing.
