Patent ID: 8327737

Claim:
A bicycle comprising a front wheel, a rear wheel, a pedal gear device, a direction control device, and a main frame, which connects the front wheel, rear wheel, pedal gear device and direction control device, the direction control device being used for controlling the direction of the front wheel, characterized in that the direction control device comprises: a handlebar; a steering stem connected to the main frame, wherein the steering stem comprises a longitudinal rod and a horizontal rod, the longitudinal rod being joined to the horizontal rod, the horizontal rod being substantially parallel to the handlebar; and two adjusting stems, each of the adjusting stems comprising an adjusting main body, a first clamping portion, and a second clamping portion, wherein the first clamping portion is located at a first end of the adjusting main body and the second clamping portion is located at a second end of the adjusting main body, and both ends of the horizontal rod are clamped when each first clamping portion is in a fastening state, and unclamped when each first clamping portion is in a non-fastening state; the handlebar is clamped when each second clamping portion is in a fastening state, and unclamped when each second clamping portion is in a non-fastening state; and a quick switch device, the quick switch device being coupled to each adjusting stem, the quick switch device being used for controlling a clamping state of each first clamping portion and each second clamping portion; wherein an attaching width on the handlebar between the two adjusting stems is more than 40 mm; wherein the quick switch device controls the clamping state of each first clamping portion and each second clamping portion simultaneously; wherein the quick switch device comprises two eccentric quick releases, each eccentric quick release controlling the clamping state of each first clamping portion and each second clamping portion of each adjusting stem; wherein each eccentric quick release comprises a pivot eccentric part and a tensioning rod, and each pivot eccentric part is located at each second clamping portion; and wherein the quick switch device comprises a horizontal connecting component for connecting the two eccentric quick releases such that the two eccentric quick releases can be operated simultaneously; when the horizontal connecting component is distal to the horizontal rod, the clamping state of each of the first clamping portions and each of the second clamping portions is the non-fastening state, and when the horizontal connecting component is proximal to the horizontal rod, the clamping state of each of the first clamping portions and each of the second clamping portions is the fastening state.