The positive linkage between chain and gear wheel allows for constant speeds even with torque fluctuations and very good reproducibility of speeds. Standard variable gear units force the transmission element PIV CHAIN CONVERTORS Variable Chain Drives through the use of excessive force – this is unnecessary and reduces the amount of efficiency.
Adjustable 
chain drives apply a lever mechanism, which applies just as much strain on the slat chain as necessary. This outcomes in low operating temps, extended life, high power density and an excellent efficiency – actually in the partial load range.