Budnitz Bicycles reports: [edited]
Budnitz Model E is the lightest electric bicycle in the world (13kg). The twin-tube single-arc cantilever frame is crafted from 3AL 2.5V titanium alloy.
Geometry is tuned for exceptional lateral stability, minimising energy loss as you pedal. It flexes in just the right places to absorb the shock of gravel, curbs and rough pavement without a clunky front suspension. Also available in 4130 Cro Moly Steel.
Model E pairs a Gates Carbon Belt Drive with a Zehus Bike+ 250W electric rear hub. Motor, sensors, and 30V L-ion 160Wh battery are sealed within the high polish aluminium rear hub. The entire drivetrain is free of oil, completely protected against rain, grit and road debris and virtually maintenance free.
It provides electric assist up to 15 MPH for a range of 20-100 miles. Coast downhill or pedal backwards to return power to the hub. Use bluetooth interface to control multiple modes and power output. Integrated slope sensors offer more support on hills and a hub locking feature adds additional anti-theft security.
Price: from $3,950 to frankly exorbitant