• April 27, 2017, 06:50:24 PM
  • Welcome, Guest
Please login or register.

Login with username, password and session length
Advanced search  


Electric Motorcycle Forum is live!

Pages: [1]

Author Topic: NuVinci CVT?  (Read 775 times)


  • Full Member
  • ***
  • Posts: 211
    • View Profile
NuVinci CVT?
« on: March 19, 2015, 07:26:47 AM »

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?


  • Jr. Member
  • **
  • Posts: 70
  • '14 Zero S, nuke charged
    • View Profile
Re: NuVinci CVT?
« Reply #1 on: March 10, 2017, 10:02:33 PM »

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.
2014 Zero S
Velomobile "Quest"
Mitsubishi i-MiEV
Pages: [1]