A continuously variable transmission, comprising: a first asymmetrical differential, having a transmission input shaft, a first output shaft (120a, 141) and a second output shaft, the first output shaft (120a, 141) and the second output shaft being aligned along a transmission axis; a second asymmetrical differential, having a transmission output shaft, a first input shaft and a second input shaft, the first input shaft and the second input shaft being aligned along the transmission axis; an independently rotatable high speed shaft coaxially passing through the first output shaft (120a, 141) and the first input shaft, the high speed shaft being coupled to the second output shaft and the second input shaft; wherein the second output shaft is a first low torque bevel gear, disposed at a first end of the high speed shaft and comprising a part of the first asymmetrical differential; and wherein the second input shaft is a second low torque bevel gear, disposed at a second end of the high speed shaft and comprising a part of the second asymmetrical differential; a one-way roller bearing clutch, disposed on the high speed shaft configured to prevent reverse rotation of the high speed shaft; and a reduction gear unit, coupled between the first output shaft (120a, 141) of the first asymmetrical differential and the first input shaft of the second asymmetrical differential, rotation of the transmission input shaft at a first input speed and torque being converted into rotation of the transmission output shaft at a second output speed and torque that varies independently of the first input speed and torque in response to a rotational resistance on the transmission output shaft, and a degree of torque transmitted via the high speed shaft to the transmission output shaft being inversely proportional to a magnitude of rotation of the reduction gear unit, wherein the high speed shaft extends through the reduction gear unit. a first asymmetrical differential, having a transmission input shaft, a first output shaft (120a, 141) and a second output shaft, the first output shaft (120a, 141) and the second output shaft being aligned along a transmission axis; a second asymmetrical differential, having a transmission output shaft, a first input shaft and a second input shaft, the first input shaft and the second input shaft being aligned along the transmission axis; an independently rotatable high speed shaft coaxially passing through the first output shaft (120a, 141) and the first input shaft, the high speed shaft being coupled to the second output shaft and the second input shaft; wherein the second output shaft is a first low torque bevel gear, disposed at a first end of the high speed shaft and comprising a part of the first asymmetrical differential; and wherein the second input shaft is a second low torque bevel gear, disposed at a second end of the high speed shaft and comprising a part of the second asymmetrical differential; a one-way roller bearing clutch, disposed on the high speed shaft configured to prevent reverse rotation of the high speed shaft; and a reduction gear unit, coupled between the first output shaft (120a, 141) of the first asymmetrical differential and the first input shaft of the second asymmetrical differential, rotation of the transmission input shaft at a first input speed and torque being converted into rotation of the transmission output shaft at a second output speed and torque that varies independently of the first input speed and torque in response to a rotational resistance on the transmission output shaft, and a degree of torque transmitted via the high speed shaft to the transmission output shaft being inversely proportional to a magnitude of rotation of the reduction gear unit, wherein the high speed shaft extends through the reduction gear unit.