A quick look at the Grainger site suggests that v belts are sold in full
inch increments. They do stretch. There is usually a tension adjustment. So
if you need a belt just under 25 in. you'll need to use a 24 in. If the 25
in belt is slipping a little perhaps belt dressing will help.
Actually, don't know why I didn't think of it before, but if length is
key item, there's always a link belt you can adjust to whatever length
you want within the size of the links. (I don't see much need for
them, but they're claimed by many to be the solution to vibration in
equipment like tablesaws, etc., ...)
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