Abstract: A first muffler (4) is connected to a rear end portion of the exhaust pipe (2) extending from a single-cylinder engine toward one side of a rear portion of the vehicle body and is provided on one side of the vehicle body. A second muffler (5) is provided on the other side of the vehicle body opposite to the first muffler (4) through a connecting pipe (6). An outer side surface near the front end portion of the first muffler (4) and the second muffler (5) are covered with first and second covers (7) and (8) both plated. Each of the exhaust pipe (2) and the first and second mufflers (4) and (5) have double-pipe structure with outside plated. Further, a front end portion of the second cover (8) is curved toward the center of the vehicle body, and a phantom line as a continuous frontward extension from the front end portion of the second cover (8) is positioned before the axis of the connecting pipe (6).

Abstract: A bicycle brake device for increasing the braking power to be applied to the wheel of a bicycle which has caliper type brake arms mounted on the seat stay bridge by a bolt about which the caliper arms are pivotally movable. A cage is mounted on the ends of the caliper arms and has an open end and a closed end. A brake shoe is slidably carried for axial movement in the cage through the open end and has a front end and a rear end oriented with the open and closed end respectively of the cage. A brake block is carried in the brake shoe and has a surface for engaging the rim to apply friction forces for braking action. A cam is mounted at the front end of the brake shoe for engaging the seat stay upon forward sliding movement of the brake shoe in the cage as a result of friction forces between the brake block and the rim when the block engages the rim.

Abstract: To prevent the detachment of the front wheel of a bicycle from the front fork formed of a pair of laterally spaced fork arms each having a free end with an open ended slot arranged to receive the hub spindle of the front wheel which is secured to the front fork by washers and hub nuts, the slot is shaped to have at least one portion which is positioned at the place occupied by the hub spindle when it is assembled within the front fork, that is, at the back of the slot, and which is wider than the diameter of the hub spindle and the washer is provided with a hole arranged to receive the hub spindle therein and at least one projection extending from one of its faces along the periphery of the hole. The projections are fitted into the widened portions of the slots so that even though the nuts securing the front wheel to the front fork become loose, the projections of the washers are retained in the corresponding slots in the front fork preventing the detachment of the front wheel.