Geared CVT Prototype (rather than belts)

[Zimmerframe]

Quite interesting .. if you're techy

Too physically large to combine with a motor at present, but it's just a prototype.

 

[Tim1023]

Saw that. V interesting. Not 100% sure of the benefits for mountainbiker, though. Commuting bikes certainly. Looks much heavier than, e.g. the enviolo system