This main newly developed high technology is the distinguishing part of the
central driving the special toothed shape curve of sprocket adapting a rolling
movement friction and rotating the power, emerging from previous traditional
chain sprocket and bevel gear and this chilsung gear using shall change the
history of traditional inconvenient chain Bike. The durability and capability
of riding is excellent and maintains steady status of power.
This curved & toothod gear makes more easy to rolling connect
between sprocket gear and taper-roller, which maintains quietness and precision
requiring for bike and by small operation, it can convey of the power of moment
effectively.