For type a, you subtract 2 inches. Next, we'll measure the pitch diameter (p.d), this is the measurement that represents the diameter of the belt it's self as it rides in the pulley. NACAC Request for Application Fee Waiver Form when If so, take a look at the belts that fit information on your pulley’s page. How to size a v belt . V belt pulleys or sheaves mate with drive belts in numerous power transmission applications. For type b, you subtract 3 inches. B100 has a 103 inch outside length. I currently maintain a piece of machinery ca.1900 that uses just such a belt. Use the formula or enter measurements into online calculator. Recomended for al general purpose drive with higher horsepower ratings. Roll the v belt along the flat surface until the paint mark rolls back to the flat surface. The latter is done by installing a belt with a different pitch angle. Not sure what v or wedge belt you need then simply follow our steps to find the one you require ...