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[nigezero]

Hey guys

Im a  Zero owner rather than a tinkerer and love the simplicity, but was reminded again today about NuVinci. Their planetary drive CVT looks pretty cool - anyone out there looked at them and can you tell me whats good and bad about them?

[hubert]

nuvincy is a continuous variation gearbox in the hub, for bicycles. Not for motorbikes. Don't try and put more than about 250W through a nuvinci, or it will break down quickly. Its principle is really simple but very clever made. The central sphere and the 2 sliding rings or so, connected to the sphere with a special fluid, which is both  like oil and like glue, more or less, is a masterpiece of engineering.

Please keep in mind, for the sake of simplicity, that electric motors are sooooo good that they generally don't need any gearbox or variable transmission. Just a simple chain or belt or gear and it's done. One can say that the motor controller acts like a variable gearbox, changing the quasi-fixed battery voltage into any suitable motor voltage to get the desired torque at the given rotation speed. It even can reverse the rotation without any mechanical add-on.

[Yoshidaka]

Your information is very good.

[MrDude_1]

If you want to see how it works under power, checkout the threads on endless-sphere.com about it. A few people put them on ebikes, but alot of them broke when they went too far with the power.