The spring and weight can be upgraded to increase or decrease the engagement rpm.
The 40 series has rollers and the spring holding all the rollers together, the 30 series has circular weights and circular springs. The major difference is the type of weight-spring system they both use, the weight-spring system is inside of the driver clutch (the driver clutch is the part that goes into the crankshaft), which experiences the centrifugal force as the clutch rotates with the crankshaft. Difference in Weight-springs system in Clutch The differences in parts are stated below. In terms of appearance, the way to tell them apart is from the angle in the leaves, the 30 series will be asymmetrical and the 40 series will be symmetrical, apart from that, the 40 series will be much more heavies and have a bigger belt.
As you increase the RPM the diameters changes check this article about how the torque converters work to understand it better. The speed reduction ratio is the ratio of the diameter of the belt in contact with the driver and the driven. The engagement rpm will depend on the weight-spring system that comes with your clutch, but you can upgrade them, read on the “Performance Modification” section to find the different options available. Whyte 46 Tongsheng TSDZ2 Electric Bike conversion 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: (for 7 1/2″ and 8 1/2″ driven respectively) (for 6″ and 7″ Driven respectively) 1 : 1 or 1.24 : 1 (for 7 1/2″ and 8 1/2″ driven respectively) Speed reduction ratio (Can be modified) Driven Unit dia 6″ or 7″ 7 1/2″ or 8 1/2″ Speed reduction ratio Recommended Engine 2-8hp 8-18hp Belt Type Asymmetrical Symmetrical Belt Top Width 3/4″ 7/8″ Drive clutch’s
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