E-Bike: Rear Transmission Concept
Starting up with a new concept for an Electric Bike, we started by breaking the mold a bit. A rough CAD rendering below shows the rear powertrain, reserving the body exclusively for battery power and control.
What jumps out, of course is the hub-less concept, eliminating some rotating mass. A series of smaller motors are mounted to the rim, directly driving the wheel. This will increase the unsprung mass, but it is felt it can be compensated for with proper selection of the shock and spring. The hubless concept offers its own unique challenges as well.