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Belt Measurement Help!

Aftermarket replacement belts can successfully replace many original equipment belts. If aftermarket model listing information is not available, then measurements can be used to select a replacement. Proceed as follows (non V-M products only):

Measurements Required

For each belt to be replaced, please Contact Us with:

A Type of Belt - Round cross section, square cross section, flat belt or fabric belt
B Inner Circumference – The length of the belt along its inside (driving) surface. If measuring actual part, please indicate - I will reduce it by a percentage to account for the fact that it is stretched
C Thickness – How thick the belt is from the inside driving surface to its outside surface.

If a “flat” belt then also need:
D Height (how tall if belt is sitting on a flat surface)

Note: Some “square” belts are really rectangular and may have both – thickness and height.

How to Measure

IC – The inner circumference is the length of the belt along its inside (driving) surface. One way to measure is to use two number two pencils and a thin piece of string. First put the old belt across the two pencils and move them apart until all the slack is gone. Do not overstretch. Second, with the two pencils still in their same position, put the string around the two pencils so that it is taught, and mark where the two ends of the string come together. Remove the string and measure its length from marked end to marked end. Measure as precisely as you can in inches using either fractions or decimal equivalent.

Height – The height of the belt is how tall it is if it is placed on a flat surface. Measure as precisely as you can.

Thickness – The thickness is how wide the belt is from the inside driving surface to its outside surface. Measure as precisely as you can.

Special Situations

- If the old belt is damaged such that its IC cannot be measured, use the string on the mating parts driven by the belt, and supply the measurement of the IC using this method.
- If the old belt is a cloth belt, indicate as such and provide the dimensions same as if a flat rubber belt.
- If the old belt has a non-regular construction and does not fit any of the types discussed, please email a .jpg photo.