Abstract: An arrangement in or a structure for motorcycles intended to protect a motor cyclist against injury in the event of a collision comprises a protective body (1), having a cushioning or impact surface (4) which faces the upper part of the cyclists' body. The cushioning surface has an area of at least 500 cm.sup.2, and is of such shape and so inclined that when the upper part of a motor cyclist's body lies against said surface, it forms an upwardly directed angle of at least 20.degree. to the horizontal. That part of the protective body located nearest the motor cyclist is provided with support portions lying over the thighs and knees of the motor cyclist and the structure is secured to the motorcycle by attachment means which will break at a given load so as to free the structure from the motorcycle.

Abstract: The invention provides a light weight bicycle or tricycle of low wind resistance and low center of gravity principally composed of two frames over-lapping in tandem and joined by a journaled bearing. The front part of the front frame carries a bracket for the front wheel; the rear part of this frame is first depressed and then bent upwardly to provide a seat for the rider and a back rest. The rear frame largely extends under the rear part of the front frame and carries a rear bracket (or brackets) for the rear wheel (or wheels). The front of this frame is bent substantially vertically upwardly and is joined to the first frame by a bearing which engages an upwardly rearwardly slanted journal located at about the midpoint of the front frame. The vehicle is steered by a handlebar which turns the first frame relative to the second. The vehicle is propelled by conventional pedal or motor drive on the front wheel.