| 摘要 |
<p>The invention relates to a wheel comprising: a first hub (21), a second hub (22) to be moved between an inner position wherein the width of the double wheel is at its minimum and an outer position wherein the width of the double wheel is at its maximum; guiding devices (112) for guiding an axial movement of the outer hub (22) between the inner position and the outer position; and moving devices (212) for moving the outer hub (22) between the inner position and the outer position.</p> |
