How To Measure Belt Size Car. Internal length v belt width: Remember that the belt size usually excludes the measurement of the buckle.
Measure the width of the belt. The best way is to measure around where you wear the belt. In systems that require multiple pulleys, the sizes of the pulleys may differ, and there is usually a ratio that allows the system to run at optimum efficiency.
Hold the cloth tape measure against the length or width of the belt depending upon which measurement you need.
Alternatively, you may measure at the fold, or where the buckle meets the leather, to the hole that you currently use. If it is an odd number, round up to the next even number. The final measurement is the complete overall width of the pulley. Adjust to a slightly lesser length to ensure tightness when measuring an existing belt that has stretched.