The other, more common style of ring-and-pinion is hypoid. This is when the pinion is above or below the ring gear centerline. The farther the pinion is from the axle centerline, the greater the hypoid offset. As hypoid offset is increased, a larger pinion gear is required, with an increase in gear tooth contact and in strength. However, friction increases too, which can reduce the gears' efficiency in transmitting power.