StringBike. No chain, just strings.
From Rohloff to Pinion to Strings. :-)
Appears to have 19 speeds and can be shifted while stationary. Total range of 250%. Wide Q-factor. No dishing needed for the wheels. Due to symmetry of drivetrain, perfect alignment of drive components. The drive does not require lubrication or maintenance and uses a polyethylene rope.
Left and right sides do not need to use the same gearing. Therefore if one has a disability, a bike could be tailored to meet asymmetric strength requirements.
How It Works
How To Change Gears
How Efficient Is It?
How Does It Feel Compared to a Chain Drive?