A Pinion is a ger usually meshed with a driven gear is used for power transmission. The power from the source is directly transmitted to pinion by means of shafts, belts or chains etc.. A pinion is the live gear in the drive train. It is therefore very Important to design a pinion in such a way that it withstands all the designed loads on the transmission system. There are several parameters which influence the design of a pinion gear. In this paper we deal with design and analysis of all the gear pinions like spur, helical and bevel pinions.