Roll Circumference Non Slip Not Matching Gear Pitch Gears and Gear Drives R Keith Mobley , in Plant Engineer's Handbook , 2001 Pitch measurements The size and proportion of gear teeth are designated by a specific blazon of pitch. In gearing terms, in that location are two types of pitch: circular and diametric. Circular Round pitch is the distance from a point on 1 molar to the corresponding betoken on the next tooth measured along the pitch circle as shown in