Abstract: A bicycle is disclosed. A direction control device thereof comprises a handlebar, a steering stem, two adjusting stems, and a quick switch device. The steering stem is connected to the main frame and comprises a longitudinal rod and a horizontal rod. Each adjusting stem comprises an adjusting main body, a first clamping portion, and a second clamping portion. Both ends of the horizontal rod are clamped by each first clamping portion; the handlebar is clamped by each second clamping portion. There are two clamping states of the first and second clamping portions: a fastening state and a non-fastening state. The quick switch device is coupled to each adjusting stem and controls the clamping state of each first clamping portion and each second clamping portion.

Abstract: A bicycle bag which comprises a covering body, a main support strap, a first connection device and a second connection device is disclosed. The major characteristic of the present invention is that the main support strap, the first connection device, and the second connection device are directly or indirectly connected with each other. By means of associating with connection members, the first connection device and the second connection device can be fastened to a bicycle. Therefore, when the first connection device and the second connection device receive a force from the weight of the bicycle, the main support strap is capable of bearing such a force.

Abstract: A bicycle is disclosed. A direction control device thereof comprises a handlebar, a steering stem, two adjusting stems, and a quick switch device. The steering stem is connected to the main frame and comprises a longitudinal rod and a horizontal rod. Each adjusting stem comprises an adjusting main body, a first clamping portion, and a second clamping portion. Both ends of the horizontal rod are clamped by each first clamping portion; the handlebar is clamped by each second clamping portion. There are two clamping states of the first and second clamping portions: a fastening state and a non-fastening state. The quick switch device is coupled to each adjusting stem and controls the clamping state of each first clamping portion and each second clamping portion.