70292 ⎘
Transmissions characterised by use of friction rollers engaging the periphery of the ground wheel with means for moving roller into driving contact with ground wheel
Direct-drive bicycle
#2Electric friction drive device and electric drive system
#3Portable motor assembly
#4Propulsion device for a bicycle
#5Power assisting device and bicycle using same
#6Electric drive for bicycles
#7Universal low-friction bicycle hub transmission
#8Variable speed direct drive transmission
#9Member for fixing a bicycle driving device