The belt in the 30 series is asymmetrical meaning one side is nearly flat while the other side has an angle to it while the 40 series belt has symmetry, both sides are equally tapered. ![]() The driver units of 30 series come for both 3/4″ and 1″ crankshaft, and the 40 series comes for 7/8″ and 1″ crankshaft diameter. The driven units can come in different diameters and you can change them to your liking to get higher or lower speed reduction ratios, do keep in mind though, if you change the diameter of the driven, you’ll also need to change the belt. The specs are taken from comet’s user manual (the clones are all the same and will have the same specs) Driven unit: ![]()
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