Chain structure for bicycles
 A chain structure for bicycles is composed of a series of inner chain plates, outer chain plates, rollers, and pins. Each inner plate has three arcuate peripheries at respective ends and slanting surfaces along one side of the arcuate peripheries. Each outer plate has also three arcuate peripheries at respective ends and slanting surfaces along one side of the arcuate peripheries. The slanting surfaces of the inner chain plates and outer chain plates are adapted to facilitate engagement of sprocket teeth with the chain plate. 
Yaban Chain Industrial Co., Ltd.
B B F
B62M B62M F16G
additional inventional inventional
Wen-Bin
Wang