| 摘要 |
<p>A bicycle having rotatable drive member in the form of a hollow drum (22) with pedals (48, 49). Each pedal is mounted in a foldable manner to a crank arm (24, 25) which in turn is mounted to the drum (22) by a pivoting mechanism (26, 27) allowing the pedals to be moved between an operative configuration in which each pedal projects outwardly from the drum (22), and an inoperative configuration in which each pedal (48, 49) and each crank arm (24, 25) is contained within the interior of the drum (22). The bicycle can thus be used as a training aid without the use of pedals, or in a conventional manner.</p> |
